Singapore math gr 3 textbook 3a

PRIII'IARY nnATFfEnnATrES 3A 0/ Q[6 cr**,aururrr Purlrnc e DevEropMENT Drvrsror'r Mtusrnv oF EDUcArtoN, Strucepone I PROMARV NATHCMNTOGB 8A Primary Mathematics Proiect Team Proiect Dlrector Dr Kho Tek Hong Team Members Chee Kum Hoong, Hector Chip Wd Lung Liang Hin Hoon Lim Eng Tann Lim Hui Cheng, Rosalind Ng Hwee Wan Ng siew Loe Curriculum SPeclalisis Cheong Ngan Peng, Chrlstina Ho Juan Beng Sin Kwai lvleng $/o r; m*lw I'Lullc IIEI & DsEv E LopPM E Nr D rvr s I o N ilil'utflJl'uu"noon PREFACE The Primory Mothemotics Pockoge comprises textbooks, workbooks, teocher's guides ond oudio-visuol moteriols The moin feoture of the pockoge is the use of the Concrete r Pictoriol r Abstroct opprooch The pupils ore provided with the necessory lecrning experiences beginning with the concrete ond pictoriol stoges, followed by the obstroct stoge to enoble them to leorn mothemotics meoningfully Like the previous editions of the pockoge, this edition encouroges octive thinking processes, communicotion of mothemoticol ideos ond oroblem solvino This textbook is occomponied by two workbooks ond o teocher's guide lt comprises units Eoch unit is divided into ports: Q, @, Eoch port storts with o meoningful situotion for communicotion ond is followed by specific leorning tosks numbered 1,2, The srg n is used to link Lhe textbook Lo the workbook exerctseS Proctice exercises ore designed to provide the pupils with further proctice ofter they hove done the relevont workbook exercises Review exercises ond revision exercises ore orovided for cumulotive reviews of concepts ond skills All the proctice exercises, review exercises ond revision exercises ore optionol exercises The colour potch I is used to invite active porticipotion from the pupils ond to focilitote orol discussion The pupils ore odvised not to write on the colour Dotches - Numbers to 10 000 Thousonds, Hundreds, Tens ond Ones PRACTICE 14 12 Number Potterns t5 14 PRACTICE 1C 17 PRACTICE 1B Addition ond Subtroction Sum ond Difference PRACTICE 2A PRACTICE 2B Adding Ones, Jbns, Hundreds ond lnousonos Subtrocting Ones, Tens, H undreds ond Thousonds PRACTICE 2C PRACTICE 2D Two-step Word Problems PRACTICE 2E 18 22 23 24 2A 34 35 36 38 Multiplicdtion and Divison Looking Bock PRACTICE 34 More Word Problems PRACTICE 38 PRACTICE 3C Multiplying Ones, Tens ond Hundreds PRACTICE 3D PRACTICE 3E PRACTICE 3F Quotient ond Remoinder Dividing Hundreds, Tens ond Ones e, J7,9tn " W at(h -4+ 39 43 44 47 48 49 )z+ 55 56 57 61 PRACTICE 3C PRACTICE 3H REVIEW A 65 oo 67 Multiplicotion Tobles of 6, 7, ond 'I Looking Bock Multiplying ond Dividing by PRACTICE 44 68 70 75 76 Multiplying ond Dividing by PRACTICE 48 80 PRACTICE 4C 81 Multiplying ond Dividing by PRACTICE 4D a2 84 85 86 89 90 PRACTICE 4E Multiplying ond Dividing by PRACTICE 4F PRACTICE 4C Money Dollors ond Cents PRACTICE 5A Addition Subtroction PRACTICE 58 102 PRACTICE 5C 103 REVIEW B 91 93 94 98 1o4 Numbers to 1O 000 @ thousonds, Hundreds, Tens qnd Ones aaoaaaaaaa 10 ones rEEEE :::tl t T ten + I hundred 10 tens TFEEE EEEEE '10 (o) * hundreds l thousond Sumin collected some morbles E8 E3 hundreds EE tens $.ttrl 3oo+40+9=l aara aaa ones o""@ IE', (b) His sister olso collected some morbles 8E FE thouscnds hundreds E 88 ca aoo tens ones 2000+400+30+5=l How mony morbles did she collect? Two thousond, four hundred ond thirty-five Reod the numbers 5998 ond 6012 (d) LOUnt TrOm 5yy6 to bu tl5999, 6000, 6012 (e) Count from 9987 to 10 000 Count the thousonds, hundreds, tens ond ones in this chort @@@ @@ 3ooo+200 @@@ @@@ @ ooo o +70+4=l three thousond, two hundred ond seventY-four Whot numbers ore shown below? Reod eoch number @@ @@ @@ @ @@@ ooo oo ooo ooo o @@ @@ @@ @@@ @@ "; -> 6824 is o 4-digit number The digit stcnds for 20 The digit stonds for 6000 Whot does the digit stond for? Whot does the digit stond for? Whot does the diqit stond for in eoch of the following numbers? (o) 3s21 (b) s213 (c) 12s3 ln 3468, the digit is in the ones ploce Its volue is The digit is in the tens Ploce Its volue is 60 I The digit Its volue is I The digit Its volue is is in the hundreds ploce ! is in the thouscnds ploce I Whot is the volue of eoch digit in 8137? q 1_-*.* k'"*, \ Which is greoter, 316 or 264? && & @ ro t5 greoler wnlcn rs &&& e&& & & @@@ @@@ &e && tnon zb4 smo er, Sl5 0( 352! && & @ &&e @e& && @@@ & &@@& 325 is smoller thon 352 (c) which (b) greoter,4316 or 4264? Which greoter, 4316 or 5264? Which IS smo||er, z3z5 or 2352? Which is smoller,3325 or 23521 ts Write the word (o) 7031 is (b) 8004 is 3756 is I I I greqter or smoller in ploce of eoch thon 7301 thon 8040 thon 3576 5073, 4942, 4973 Which is the greotest number? Which is the smoilest number? l Money Dollors qnd Cents $35.25 Reod the prices of these items $35 2sa The dot seporotes the cents from the dollors 'tr fiQo & $35.25 = | dollors I cents 5o7.25 = >75.+u = I oo',or, I | oorrors I cenrs cents $32.75 = 9'i | dollors I cents How m uch money is the in eoch set? (o) @@@@ dollors ! $l ce @@ (b) I dollors I cents = $l (o) Write $ 1.25 in cents $1.25 = (b) Write 170( in dollors ond cents 17Oc Ic = $l Write in cents (o) $0.30 (b) $1.es Write in dollors ond cents (o) 8sc (b) 160a (c) $a.Os (c) 345a How much more money is needed to mcke $1? (o) $0.70 + (b) $o.ss + $l=$1 = $l $1 r ,,"" ".-" 92 \ PRACTICE 5A Write in cents (o) $0.20 (d) $z.os $o.es $s.60 (b) 60a (e) 8ssc 30c+l= $1 (c) $0.+o + I =$1 (c) 400a (f) 305{ (b) I +45c=$1 (d) I + $0.65 = $1 (o) twenty-cent coins = 12 five-cent coins (c) (f) q? qc Find the missing omount of money in eoch of the following: (o) (c) $7.00 Write in dollors ond cents (o) s{ (d) 210s (b) (e) = $l $l Lily hos twenty-cent coins ond 12 five-cent coins How much money does she hove oltoqether? There ore five-cent coins, twenty-cent coins ond one-dollor coins in o purse Whot is the totol omount of money in the purse? 93 O Addition Mrs Chen bought o box of chocolotes for $13.25 ond o coke for $6.50 How much did she spend oltogether? r3wffi Cost of ccke Cost of chocolotes @ @ Totol cost of chocolates cnd coke $13.2s+$6.s0=$I She spent $l oltogether 94 Find the volue of (o) $1.s0 + 20a (c) (e) $38.40 + 3s( $2s.40 + 60c (o) (b) $2.8s+2oe=$l $2.7o+60c=$l $5.65+45c=$l (d) $16.95 (b) $14.20 + 65a (d) $2.75 + 25a (f) $33.85 + 15( $2.85 + 20a /\ 15( +45c=$l 5a 85c ond 15( make $24.70+95c=$l (o) $25.70 * $o , $l *'on , $l $2s.7o+$4.10=$l (b) s34.6s -12 ' sl -l!!:- sa $34.6s+$2.3s=$I (c) $30.80 + $s ) $l * oou , $l * too , $l $30.80+$s.40=$l (d) $24.70 + $10 ) $l $24.70 + $10.s0 = A Find the volue (o) (c) (e) $l of $14.65 + $6.20 $32.70 + $24.s0 $40.8s + $19.6s (b) $13.60 + $24.40 (d) $1s.60 + $23.70 (f) $28.3s + $26.7s 95 $1 We odd $24.55 ond $13.65 like this: 2455 + 1365 $24.ss + $ 13.65 $38.20 Use this method to find the vclue (o) $3s.30 + $21.40 (b) $27.10 + $10.s0 (c) (d) (e) (f) $a0.70 $s2.8s $28.6s $36.90 + + + + of $33.60 $16.3s $32.4s $24.8s i Ali bought o toy cor for $6.95 He olso spent $2.80 on o meol How much money did he spend oltogether? $2.80+$6.9s=$l He spent $l cltogether 96 -.,,,-.,,*,*, \ Mingfo poid $11.90 for o pen He hod $24.65 left How much money did he hove ot first? $1r.90 $24.65 $11.90+$24.6s=$l He hod $l ot first John soves $6.75 this week He soves $2.35 less this week thon lost week How much money did he sove lost week? $6.75 $6.75+$2.3s=$l He soved $l lost week l97 **;,."* * \ Subtrqction Mr Wu bought o radio ond o colculotor for $56.50 Ine cotcutotor cost st5.5u How much did the rodio cost? @@ @@@ @@@ @@@ Cost of rodio ond colculotor a ,,?1ffi, :ffi' r',ffi:,:.ffi @@@ '.ffi @@ @@@ @@@ Cost of colculqtor Cost of rodio $s6.s0-$2s.30=$l The rcdio cost $I 98 Find the volue of (b) (d) - (o) $2.60 2oa (c) $3s.8s 45a (e) $6.s0 4sa (f) -60a=la - $8.7s 30c $1.s0 2sa $46.70 2sa - -la - (b) $1.30 6oa (d) $1.40-85c=Ic (o) $1 (c) $1.25-35(=lc 3.(c) $3.20-80c=$l 93.20 -90c=$l $I - (b) $14.6s (c) $46.25 4sc = (d) $32.0s-85c=$l (") $42.30-55c=$l $2.20 - 80a $1 Subtract 800 from (o) $16.80 - $4 > $I - 6ou , $l $16.80-$4.60=$I * (b) $37.70 $10 > $l $37.7o - $10.20 = * Find the volue of (o) (c) (e) $I soa , $I (b) (d) - $47.s0 $12 $s8 $12.60 $2s.0s $1s.3s - , $l (c) $29.20 - $12 ) $l $29.20-$12.s0=$l tou (f) - 99 $3s.70 $64.40 $s6.20 $0.8s $11.60 $28.9s $1 We su btroct )25 /u rrom )4b.zu - $46.20 $23.70 $22.s0 ttKe tnts: Use this method to find the voiue of (o) $as.10 $23.40 (b) $36.3s (c) (e) $s4.60 $70.20 (d) $37.80 $28.7s Find the volue (f) Find the volue (o) $10 (d) sso $s2.2s $6s.os (b) $62.00 (d) $40.0s - $4.1s $8.3s of $4.7o (b) $30 $23.80 $100 - $7.20 (c) - $s2.90 (f) Noncy bought o box of biscuits which cost She gove the coshier $10 How much chonge did she receive? $10-$s.6s=$I She received $3s.4s $3s.1s of (o) 6200 - als (c) 400s - 83s $10.8s gl chonge 100 $8.2s $100 - $39.4s $s0 10 Meili hod $20 She bought on umbrello ond hod $14.60 left Whot wos the cost of the umbrello? $20 $14.60 $20-$1a.60=$I The umbrello cost $1 11 Minghuo hos $25.50 He wonts to buy o wotch which costs $35 How much more money does he need? $2 s.s0 $3s $3s-$2s.s0=$l He needs $! more 101 PRACTICE 58 Add (o) (c) (e) /h\ q?g 4q + $60.55 $26.20 + $13.s0 $48.40 + $27.30 $6s.8s + $2s.80 Subtroct (o) $36.70 (c) $s2.30 (e) $72.20 - (d) $15.95 + $24.3s (f) $36.45 + $s4.ss clq ?q (b) $60.s0 (d) $40.0s (f) $81.00 $30.70 $26.9s $24.4s $16.30 $31.8s After spending $24.60, Meihuo hod $76.40 left How much money did she hove ot first? Mingfo wonts to buy o fishing rod which costs $62.50 He hos only $48.60 How much more money does he need? A toy cor costs $16.80 A toy ceroplcrne costs $5.60 more thon the toy cor Whot is the cost of the toy oeroplone? o Sumin hod $10 After poying for his lunch, he hod $6.95 left How much did his lunch cost? A blouse cnd o skirt cost $42.50 The blouse cosls $"16.85 Whot is the cost of the skirt? Meilin hod $40.50 She bought c pen for $6.80 ond c book for $ 13.20 How much money hod she left? 102 PRACTICE 5C Find the vqlue of eoch of the following: (b) (q) $14.85 529.65 $40.80 $34.45 $72.95 A bodminton rocket costs $15.90 + $26.15 + $0.95 + $59.20 + $28.95 + $26.95 $2s.60 $41.90 $s0.00 $32.0s $64.2s - 522.3s - $16.7s $31.0s - $22.9s - $3s.9s - A tennis racket costs $42.50 How much checper is the bodminton rocket thcn the tennis rocket? The usuol price of o rodio is $43 Its sole price is $29.95 How much cheoper is the sole price thon the usuol price? Sumei hos $10.80 Her mother gives her some more money' She hos $12.30 now How much money hos her mother given her? Mr Chen bought some vegetobles for $2.4O and o fish for $3.70 He hod $21.30 left How much money did he hove ot first? 10 Mrs Wu bought o chicken ond o duck The chicken cost $5.70 The duck cost $1.95 more thon the chicken How much did she spend 103 REVIEW B Find the volue of eoch of the following: (o) 609 + 92 820- 118 49x6 96+ (b) 982 + 128 903 -294 2O4x7 1O4+7 4976 + 24 2096 3005 342 260 Aihui worked in o foctory for doys She wos poid $45 eoch doy How much did she eorn oltogether? Mrs Rojo poid $56 for some durions How mony kilogroms of durions did she buy? l Lily weighs 29 kg Her fother is times os heovy os she How much heovier is Lily's fother thon Lily? Mr Lin bought 2500 tiles He used 1164 tiles for one room ond 940 tiles for onother room How mony tiles were left? people bought o birthdoy present for their friend They poid the coshier $100 ond received $48 chonge lf they shored the cost equolly, how much did eoch person poy? 10 Cik Foridoh bought pcckets of biscuits for o porty There were 12 biscuits in eoch pocket After the po rty, there were 28 biscuits left How mony biscuits were eoten ot the porty? 104 Cunnrcur.ur,,r PuNNING & DEvEropMENr DtvtstoN C/ qIO MrNrsrRy oF EDucAfloN, StNGApoRE ' " .i tvtarshall i, i Education 50t 973 931 0t 3"i49 ? (avendish iljilililJiiltilffi ... which (b) greoter, 431 6 or 4264? Which greoter, 431 6 or 5264? Which IS smo||er, z3z5 or 235 2? Which is smoller ,33 25 or 235 21 ts Write the word (o) 7 031 is (b) 8004 is 37 56 is I I I greqter or... number pottern (o) (b) (c) (d) 634 2, 6442, 6s42, 634 2, 734 2, 834 2, 634 2, 634 3, 634 4, 634 2, 63s2, 636 2, 14 a, a, l, l, I I I I (o) Whot number is 100 more rhon 36 24? @@@ @@@ @@@ :ez+ 1J95 /1-... Find the volue of ecch of the following: (c) (b) (c) 31 3 30 5 + 179 184 31 6 31 0 + 184 31 0 187 37 1 627 265 + 161 668 + 475 600 - 38 2 37 4 - 36 1 23 730 + 724 + 746 470 - Mr Wong poid $850 for o television