,hippo ,unit ,a

            ,table ( ,3t5ts

,meet ! ,hippo """""""""""""""""""""" #a
,:at ! ,hippo ,looks ,l """"""""""""" #b
,! ,hippo's ,habitat """""""""""""""" #c
,hippo ,unit ,a ,ma? ,skills """""""" #d
,problems = ,hippo ,unit ,a
  ,problem #a """"""""""""""""""""""" #e
  ,problem #b """"""""""""""""""""""" #f
  ,problem #c """"""""""""""""""""""" #h
  ,problem #d """"""""""""""""""""""" #i
  ,problem #e """""""""""""""""""""" #aj
  ,problem #f """""""""""""""""""""" #aa
,3clu.n """""""""""""""""""""""""""" #ab
,gloss>y """"""""""""""""""""""""""" #ac









             ,meet ! ,hippo

  ,hippos >e l>ge ^1mammals4 ,on l&1
only ! rh9o & elephant >e bi7]4 ,! hippo
is unusual 9 t x sp5ds mo/ ( xs life 9 !
wat]4 ,9 fact1 xs full "n 8hippopotamus0
comes f an ^1anci5t ^w = 8riv] horse40
,xs eyes1 e>s & no/rils >e at ! top ( xs
huge h1d1 s t ! hippo c see & br1! :ile
mo/ ( xs body is "uwat]4 ,hippos >e n !
l>ge/ ( ! l>ge l& ^1mammals b !y >e !
mo/ dang]\s4 ,9 spite ( _! ^1bulk1 !y c
run fa/] ?an a human = a %ort 4t.e s y d
n want to get 9 _! way6










        ,:at ! ,hippo ,looks ,l

  ,! graphic ( ! hippopotamus %[s x f !
side ) xs h1d on ! left4 ,xs l>ge h1d is
d[n1 & xs ?ick blunt nose is close to !
gr.d4 ,! left eye & "o small r.d e> >e
visible4 ,! m\? is drawn z a l9e t
ext5ds back alm to xs eye1 su7e/+ a wide
m\?4 ,! hippo's %ort legs h po9t$
hooves4 ,xs ?ick h1vy body has a hair.s
tail t has a few hairs at ! 5d4
  ,! animal graphic is sep>ate4












                                      #b
          ,! ,hippo's ,habitat

  ,hippos live 9 ! s\!rn "p ( ^1,africa4
,!y love wat] & w sp5d m* ( _! "t /&+ 9
riv]s & lakes ) j ! top ( _! h1ds %[+
abv ! surface4 ,hippos w al roll 9 mud
to help protect _! sk9 f ! hot ,african
sun4 ,at ni<t1 :5 x is cool]1 hippos w
move onto ! ^1grassl&s 9 se>* ( food1 :
is mo/ly grass & small plants4 ,hippos
>e s l>ge t !y d n h _m natural
^1pr$ators o!r ?an p4












                                      #c
      ,hippo ,unit ,a ,ma? ,skills

  ,le>n m ab ! hippo z y "w ) ^1v>iables
& ^1expres.ns4 ,9 ? unit1 y'll set up
^1expres.ns ) an un"kn value & use
sub/itu;n to solve = ! answ]4
  ,tactile graphics >e provid$ to solve
problems #b & #e4
















                                      #d
      ,hippo ,unit ,a ,problem #a

    ,problem3 ,hippos >e v l>ge animals1
    b !y >e usually n v active4 ,x does
    n take m* 5]gy to lie >.d 9 ! mud4
    ,a hippo eats #hj ^1p.ds ( grass 9
    #d h\rs4 ,9 ! equa;n
    _% #4x .k #80, _: ;x repres5ts !
    numb] ( ^1p.ds ( grass ! hippo eats
    p] h\r4 ,f9d ! value ( ;x4
,h9t #a3 _%#4x is multiplica;n4 ,undo !
  multiplica;n by divid+ bo? sides by
  #d4
,h9t #b3 ,d\ble-*eck yr answ] by
  multiply+ #d "ts ! value ( ;x4 ,yr
  answ] %d 2 #hj p.ds4








                                      #e
      ,hippo ,unit ,a ,problem #b

       ,sweet;s ,rat+s = ,?ree
     ,types ( h"oy by ,3c5tra;n
7777777777777777777777777777777777777777
                   ,orange    
,h"oy      ,clov]  ,blossom  ,wildfl[]
3c5tra;n   ,h"oy   ,h"oy     ,h"oy
"33333333  "33333  "3333333  "33333333
_%
#0.25 """  #98 ""  #99 """"  #98
#0.50 """  #130    #125 """  #120
#0.75 """  #137    #137 """  #132
#1.00 """  #130    #134 """  #130
_:
gggggggggggggggggggggggggggggggggggggggg








                                      #f
      ,hippo ,unit ,a ,problem #b

    ,look at ! tactile graphic4
    ,problem3 ,! table %[s ! av]age
    wei<t 9 p.ds = "s ( ! l>ge/ animals
    alive td1 9clud+ ! elephant1 ! :ite
    %>k1 & ! rh9o4 ,! av]age wei<t = !
    hippo is half ! rh9o's wei<t plus
    #ejj ^1p.ds4 ,:at is ! hippo's
    av]age wei<t8
,h9t #a3 ,let ;,r /& = ,rh9o wei<t & ;,h
  = ,hippo wei<t4 ,!n _% ?1/2#r _: plus
  #ejj equals ;,h4
,h9t #b3 ;,r equals #gjjj p.ds4 ,divide
  #gjjj by #b1 & !n add #ejj to f9d ;,h4









                                      #g
      ,hippo ,unit ,a ,problem #c

    ,problem3 ,hippos >e huge animals b
    _! legs >e q %ort = _! size4 ,9
    fact1 a hippo's body is usually #c
    "ts z l;g z xs hei<t f xs feet up to
    xs %\ld]s4 ,an adult male hippo is
    #e ^1feet tall4 ,if ;x repres5ts xs
    hei<t 9 ! equa;n _% #3x .k l5gth, _:
    h[ l;g is ! male hippo8
,h9t #a3 ,9 ? equa;n1 ;x repres5ts !
  hippo's hei<t1 : is #e feet4
,h9t #b3 ,multiply ;x by #c to f9d !
  l5g?4










                                      #h
      ,hippo ,unit ,a ,problem #d

    ,problem3 ,"o r1son t hippos >e
    dang]\s is t !y h f\r unusually l;g
    tee?3 ,two >e 9 ! upp] jaw1 & two 9
    ! bottom jaw4 ,^! tee? >e us$ 9
    fi<ts ) o!r hippos4 ,unlike human
    tee?1 ! hippo's tee? keep gr[+ = xs
    5tire life4 ,"o ye>1 a hippo's tee?
    7 #ae ^19*es l;g4 ,! foll[+ ye>1 !
    tee? 7 _% #16.2 _: ^19*es l;g4 ,use
    ! expres.n _% #15+x .k #16.2 _: to
    f9d ! gr[? rate p] ye>4
,h9t #a3 _% #15+x .k #16.2 _: is addi;n4
  ,to solve1 subtract #ae f bo? sides (
  ! equa;n4
,h9t #b3 _% x .k #16.2-15 _:







                                      #i
      ,hippo ,unit ,a ,problem #e

    ,look at ! tactile graphic4
    ,problem3 ,! circle graph %[s ! am.t
    ( "t t hippos sp5d ly+ >.d1 fe$+ &
    do+ o!r ?+s4 ,mo/ ( _! "t is sp5t
    ly+ >.d 9 ! mud1 try+ to keep cool4
    ,use ! values 9 ! graph to figure \
    h[ _m h\rs a "d hippos sp5d do+ ?+s
    o!r ?an ly+ >.d & fe$+4 ,rememb] t a
    "d is #bd h\rs4
,h9t #a3 ,set up an equa;n ": ! h\rs =
  ly+ >.d1 fe$+ & o!r ?+s equal #bd
  h\rs4
,h9t #b3 ,! equa;n is
  #16+0+x .k #24_4 _: ,t's ! same z
  #20+x .k #24_4 ,subtract #bj f
  bo? sides to f9d ;x4






                                     #aj
      ,hippo ,unit ,a ,problem #f

    ,problem3 ,hippos >e com=table 9 !
    wat]4 ,9 fact1 ! "n 8hippo0 comes f
    ! ,greek ^ws = 8riv] horse40 ,a
    hippo c hold xs br1? "uwat] = five
    m9utes4 ,h[ _m "ts does ! hippo h to
    br1! 9 "o h\r8 ,rememb] "! >e #fj
    m9utes 9 "o h\r4 ,use ! equa;n
    _% #5x .k #60, _: ": ;x repres5ts !
    numb] ( br1?s4
,h9t #a3 _% #5x .k #60 _: m1ns t #e "ts
  ;x equals #fj4 ,to undo ?1 divide bo?
  sides ( ! equa;n by #e4
,h9t #b3 _% x .k #60 divid$ by #e4









                                     #aa
                ,3clu.n

  ,y h complet$ ,hippo ,unit ,a4 ,3t9ue
on to ,hippo ,unit ;,b = m practice 9
"w+ ) ^1v>iables & ^1expres.ns4



















                                     #ab
                ,gloss>y

,africa ,africa is a l>ge 3t95t 9 !
  ,s\!rn ,hemisp"h4 ,x 9cludes c.tries
  s* z ,s\? ,africa1 ,namibia & ,k5ya4
anci5t ,anci5t m1ns "s?+ t is v old4
bulk ,bulk m1ns "s?+ l>ge 9 size4
expres.n ,an expres.n is a ma? phrase t
  c 9clude numb]s1 op]a;n symbols l plus
  signs1 & v>iables l ;x4
feet ,feet "<plural ( foot"> >e a
  m1sure;t ( l5g?4 ,"o foot is #ab 9*es4
  ,mo/ #ab-ye>-old *n >e ab #e feet
  tall4
grassl&s ,grassl&s >e l>ge >1s ( l& ":
  mo/ ( ! plants >e wild grasses4
9* ,an 9* is a unit ( m1sure;t ( l5g?4
  ,! 4t.e f ! 5d ( yr ?umb to ! f/
  knuckle is ab #a 9*4
mammal ,mammals >e w>m-blood$ animals t
  >e cov]$ ) hair & fe$ _! "y ) milk
  produc$ 9 _! bodies4 ,examples >e
  be>s1 dogs1 & elephants4
p.d ,a p.d is a unit ( m1sure;t t
  describes wei<t4 ,a small book     #ac
  wei<s ab #a p.d4 ,! av]age adult wei<s
  2t #ajj & #bjj p.ds4
pr$ator ,a pr$ator is an animal t hunts
  o!r animals = food4
v>iable ,a v>iable is a lr t /&s = a
  quant;y t is n "kn yet 9 a ma?
  problem4

















                                     #ad
            ,hippo ,unit ;,b

            ,table ( ,3t5ts

,meet ! ,hippo """""""""""""""""""""" #a
,:at ! ,hippo ,looks ,l """"""""""""" #b
,! ,hippo's ,habitat """""""""""""""" #c
,hippo ,unit ;,b ,ma? ,skills """"""" #d
,problems = ,hippo ,unit ;,b
  ,problem #a """"""""""""""""""""""" #e
  ,problem #b """"""""""""""""""""""" #f
  ,problem #c """"""""""""""""""""""  #g
  ,problem #d """"""""""""""""""""""  #h
  ,problem #e """"""""""""""""""""""  #i
  ,problem #f """""""""""""""""""""" #aj
,3clu.n """""""""""""""""""""""""""" #aa
,gloss>y """"""""""""""""""""""""""" #ab








             ,meet ! ,hippo

  ,hippos >e f.d on ! 3t95t ( ^1,africa4
,! full "n ( ! species is
8hippopotamus10 : m1ns 8riv] horse40
,hippos >e s l>ge t !y d n h _m
^1pr$ators o!r ?an humans4 ,mo/ hippos
n[ live 9 >1s ": !y >e protect$ b !
popula;n is / decl9+ due to ^1poa*+4 ,p
hunt hippos = m1t & = ! ^1ivory 9 _!
l>ge tee?4 ,hippos l to lie 9 ! mud1 :
helps to protect _! smoo? sk9 f ! hot
sun4 ,!y al sw1t a special r$ liquid t
has h1l+ prop]ties4











        ,:at ! ,hippo ,looks ,l

  ,! graphic ( ! hippopotamus %[s x f !
side ) xs h1d on ! left4 ,xs l>ge h1d is
d[n1 & xs ?ick blunt nose is close to !
gr.d4 ,! left eye & "o small r.d e> >e
visible4 ,! m\? is drawn z a l9e t
ext5ds back alm to xs eye1 su7e/+ a wide
m\?4 ,! hippo's %ort legs h po9t$
hooves4 ,xs ?ick h1vy body has a hair.s
tail t has a few hairs at ! 5d4
  ,! animal graphic is sep>ate4












                                      #b
          ,! ,hippo's ,habitat

  ,hippos >e f.d mo/ly ne> lakes & riv]s
9 ! s\!rn half ( ! ,african 3t95t4 ,!y
sp5d mo/ ( ! "d 9 ! wat]1 keep+ cool
:ile ! sun is hot4 ,! hippo's eyes1 e>s
& no/rils >e locat$ on ! top ( xs big
h1d1 s x c /& alm cov]$ 9 wat]4 ,hippo
babies >e born "uwat]1 & _! "ms help to
lift !m up to ! surface to br1!4 ,hippos
l1ve ! wat] at ni<t :ile x is cool to
se>* = grass & o!r plants to eat4












                                      #c
            ,hippo ,unit ;,b
              ,ma? ,skills

  ,9 ? unit y w practice sett+ up &
solv+ ^1expres.ns ": ;x repres5ts a
value t y ne$ to f9d4 ,2 sure to use !
h9ts if y ne$ help6
  ,tactile graphics >e provid$ to solve
problems #b & #e4















                                      #d
      ,hippo ,unit ;,b ,problem #a

    ,problem3 ,hippos >e ^1h]bivores1
    m1n+ t !y eat plants4 ,mo/ ( _! food
    is grass b !y al eat wat] plants1
    small %rubs & tree l1ves4 ,an adult
    hippo w eat #hj ^1p.ds ( plants 9 a
    "d4 ,if "o hippo ate #aj ^1p.ds (
    wat] plants & #e ^1p.ds ( %rubs 9 a
    "d1 h[ m* grass did x eat8
,h9t #a3 ,set up an equa;n 9 :
  _% #10+5+x .k #80 _: p.ds4
,h9t #b3 ,! simplifi$ equa;n is
  _% #15+x .k #80_4 _: ,subtract #ae f
  bo? sides ( ! equa;n to f9d ! value (
  ;x4








                                      #e
      ,hippo ,unit ;,b ,problem #b

    ,look at ! tactile graphic4
    ,problem3 ,! b> graph %[s ! numb] (
    hippos t 7 f.d liv+ 9 a small
    private zoo 9 ^1,s\? ^1,am]ica4 ,use
    ! 9=ma;n 9 ! graph to f9d ! *ange 9
    ! numb] ( hippos liv+ "! f #aihj to
    #aihd4 ,assume t ! rate ( *ange is
    3/ant & pr$ict ! numb] ( hippos t 7
    9 ! zoo by #aihh4
,h9t #a3 ,use ;x to repres5t h[ _m "ts m
  hippos "! 7 9 #aihd comp>$ to #aihj4
  ,!n multiply ;x by ! numb] ( hippos 9
  #aihd4
,h9t #b3 ,if "! 7 #af hippos 9 #aihd1 "!
  w 2 #d "ts z _m 9 #aihh4







                                      #f
      ,hippo ,unit ;,b ,problem #c

    ,problem3 ,! l>ge side tee? ( !
    hippo >e l;g] 9 ! male ?an 9 !
    female4 ,on av]age1 ! male's tee? >e
    _% #1.4 _: "ts l;g]4 ,if a female
    hippo has side tee? t >e #ae ^19*es
    l;g1 h[ l;g >e ! male's side tee?
    likely to be8
,h9t #a3 ,let ;,m equal ! male's tee? &
  ;,f equals ! female tee?4 ,! equa;n is
  _% #1.4 times ,f .k ,m_4 _:
,h9t #b3 ,sub/itute #ae = ;,f4 ,n[ _%
  #1.4 times #15 .k ,m_4 _:










                                      #g
      ,hippo ,unit ;,b ,problem #d

    ,problem3 ,hippos look clumsy \ ( !
    wat] b !y c run fa/ = %ort 4t.es4 ,9
    fact1 !y c run _% #1.2 _: "ts fa/]
    ?an a human4 ,if a human c run #ae
    ^1miles p] h\r1 h[ fa/ c ! hippo
    run8
,h9t #a3 ,set up an equa;n ": ;,p equals
  p]son & ;,h equals hippo4 _%
  ,p@*1.2 .k ,h_4 _:
,h9t #b3 ,sub/itute ! p]son's spe$ = ;,p
  s t _% #1.2 times #15 .k !
  hippo's spe$4 _:










                                      #h
      ,hippo ,unit ;,b ,problem #e

    ,look at ! tactile graphic4
    ,problem3 ,! map %[s ?ree regions 9
    ,africa ": hippos >e f.d td4
    ^1,sci5ti/s pr$ict t ! hippo
    popula;n w decl9e1 & t 9 #bj ye>s x
    w 2 only _% #0.8 _: ( xs curr5t
    popula;n4 ,pr$ict h[ _m hippos "! w
    2 9 ! ,s\!rn ,africa region 9 #bj
    ye>s4 ,d n 9clude a comma 9 yr
    answ]4
,h9t #a3 ,let _% ,c .k ! current
  population, ,'& ,f .k the future
  population4 #0.8@*,c .k ,f_4 _:
,h9t #b3 ;,c is #fjjjj1 s _% #0.8 ,'"ts
  #fjjjj _: equals ! future popula;n4

  ,rememb] ! popula;n w 2 small] ?an
  x is n[4




                                      #i
      ,hippo ,unit ;,b ,problem #f

    ,problem3 ,hippos >e social animals
    & usually /ay 9 gr\ps 9 ! wat]4 ,a
    gr\p ( hippos is call$ a pod4 ,a pod
    w usually h #a male & #ab females4
    ,if "! >e #d pods1 h[ _m hippos >e
    "! 9 all8
,h9t #a3 ,let _% p .k ! numb] of hippos
  per pod' _: & multiply by ! numb] (
  pods4
,h9t #b3 _% #d times p .k the total
  number of hippos_4 _: ,multiply #d by
  #ac4










                                     #aj
                ,3clu.n

  ,y h complet$ ,hippo ,unit ;,b6 ,y set
up ^1expres.ns ) "o ^1v>iable & solv$ !m
to f9d an un"kn value4 ,? is gd practice
= _m algebra problems4


















                                     #aa
                ,gloss>y

,africa ,africa is a l>ge 3t95t 9 !
  ,s\!rn ,hemisp"h4 ,x 9cludes c.tries
  s* z ,s\? ,africa1 ,namibia & ,k5ya4
expres.n ,an expres.n is a ma? phrase t
  c 9clude numb]s1 op]a;n symbols l plus
  signs1 & v>iables l ;x4
h]bivore ,an h]bivore is an animal t
  eats mo/ly plants4
9* ,an 9* is a unit ( m1sure;t ( l5g?4
  ,! 4t.e f ! 5d ( yr ?umb to ! f/
  knuckle is ab #a 9*4
ivory ,ivory is a h>d :ite sub/.e simil>
  to yr tee?4 ,x is priz$ = jewelry4
mile ,a mile is a unit ( 4t.e equal to
  #ebhj feet4 ,mo/ p wd take ab #ae to
  #cj m9utes to walk a mile4
poa*+ ,poa*+ m1ns to take or kill an
  animal or xs e7s )\t p]mis.n4
p.d ,a p.d is a unit ( m1sure;t t
  describes wei<t4 ,a small book wei<s
  ab #a p.d4 ,! av]age adult wei<s 2t
  #ajj & #bjj p.ds4
pr$ator ,a pr$ator is an animal t    #ab
  hunts o!r animals = food4
,s\? ,am]ica ,s\? ,am]ica is a 3t95t
  3ta9+ #ac c.tries1 ! bi7e/ ( : >e
  ,brazil1 ,>g5t9a1 & ,p]u4
v>iable ,a v>iable is a lr t /&s = a
  quant;y t is n "kn yet 9 a ma?
  problem4

















                                     #ac