SAMPLE PAGES. Primary. Primary Maths Basics Series THE SUBTRACTION BOOK. A progression of subtraction skills. written by Jillian Cockings

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1 PAGES Primry Primry Mths Bsis Sris THE SUBTRACTION BOOK A prorssion o sutrtion skills writtn y Jillin Cokins

2 INTRODUCTION This ook is intn to hlp sur th mthmtil onpt o sutrtion in hilrn o ll s. Th mstry o iint mntl n writtn mthos o sutrtion is intrl to th quisition o si numr skills, upon whih mthmtis is uilt. Without ths soli ountions, hilrn will otn nountr iiultis s mthmtil onpts om mor omplx. Any ps in si numr knowl n unrstnin n l to lk o ility n onin s hilrn r prsnt with mor hllnin mthmtil onpts t shool n in thir vryy livs. Sutrtion skills r prtis hr isrtly in orr to m th prosss, ut on proiiny hs n stlish, th rltionship twn sutrtion, ition, multiplition n ivision n thn onsolit. On this irm rounin o numr is uilt, hilrn n mov orwr onintly in mths. Th xriss in th ook r sin to provi prorssion o vitl sutrtion skills. As nrl rul, th lultions on h p om mor hllnin s hilrn work throuh stions to. Som o th xriss, suh s sutrtin or, r lss hllnin tht thos on prvious ps ut r position in th ook to monstrt th prorssion o onpt. Most hilrn will t som st o this ontinuum in thir unrstnin o sutrtion. By workin throuh th xriss, unr th uin or suprvision o n ult, ny ps in unrstnin or knowl tht hilrn hv will quikly om pprnt. Guin n urthr prti n thn mploy to ill th ps or movin on. On ps whih rly hvily on mntl thniqus, Sor n Tim ror is vill. This will hlp hilrn hon thir mntl sp n ury. By th tim hil hs rh th n o th ook, thir mntl n writtn mthos o sutrtion will mor sur n thy will onint to us n pply thir skills to vrity o mthmtil prolms. This ook hs purposly voi til sriptions o vrious mthos o mntl n writtn sutrtion strtis, prtiulrly xpn mthos o writtn sutrtion. It is importnt tht hilrn r tuht ollowin th poliis n mthos r y thir shool so tht thin n lrnin r onsistnt or th hil. Thr r otn svrl wys to solv mntl or writtn lultion n mor l hilrn will njoy th hlln o isovrin irnt wys to in solution. It is oo i, howvr, to r upon mtho tht works or th hil n is prt o th shool s mntl n writtn lultions poliy. On h p, Mths Monky hs ivn tip to provi som si uin ut this os not mn tht this is th only wy to in solution. (Continu on nxt p) Copyriht HStrt Primry Lt

3 At th k o th ook, thr r lso numr lins n numr squr whih n provi support to hilrn, spilly in th rly sts o thir unrstnin. Mthos o ompt sutrtion r lso monstrt ut it is importnt tht hilrn r shown mor xpn mthos o sutrtion so tht soli ountions r li. Th xpn mthos shown to hilrn shoul lso ollow th lultions poliy o th hil s shool. To omplt mny o th xriss in th ook, hilrn will n squr ppr. SUBTRACTION () Sutrtion is th rmovin or tkin wy o on quntity rom nothr or rsin on quntity y nothr Sutrtion is th invrs (opposit) o ition Sutrtion is not ommuttiv, whrs ition is ommuttiv THE VOCABULARY OF SUBTRACTION sutrt sutrtion tk (wy) minus lv invrs o ition how mny hv on? on lss, two lss, tn lss, on hunr lss how mny wr is...thn...? + quls + ut os not qul wht is th irn twn? rs ru rmov how mny r lt / lt ovr? Copyriht HStrt Primry Lt Th ps o this ook my print or photoopi or us in th purhsin institution only.

4 THE SUBTRACTION BOOK CONTENTS PAGE OBJECTIVE Sutrt numrs rom (numr ons to ) Sutrt ny numrs low Sutrt numrs rom ( or lss) Sutrt numrs rom (yon ) Sutrt numrs rom n low Sutrt ny numrs low Sutrt numrs rom Sutrt numrs rom Sutrt ny numrs low Sutrt numrs rom (multipls o ) Sutrt numrs rom (multipls o ) Sutrt numrs rom Sutrt ny numrs low (not riin th ounry) Sutrt ny numrs low (riin th ounry) Sutrt iit numrs (in missin numrs) Sutrt iit multipls o (not riin th ounry) Sutrt iit multipls o (riin th ounry) Sutrt iit multipls o Sutrt multipls o (in missin numrs) A on to in smll irn (iit numrs) A on to in smll irn (iit numrs) A on to in smll irn (riin th ounry) Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr (riin th ounry) Sutrt rom ny iit numr Sutrt rom ny iit numr Sutrt rom ny iit numr Roun up n ompnst whn sutrtin,, t Sutrt y prtitionin (iit numrs) Sutrt y prtitionin (iit numrs) Roun own n ompnst whn tkin,, t Us writtn mtho to sutrt rom iit numrs Us writtn mtho to sutrt rom iit or iit numrs Us writtn mtho to sutrt rom iit numrs (Prt ) Copyriht HStrt Primry Lt

5 THE SUBTRACTION BOOK CONTENTS PAGE OBJECTIVE Us writtn mtho to sutrt rom iit numrs (Prt ) Us writtn mtho to sutrt rom iit numrs (Prt ) Us writtn mtho to sutrt rom iit numrs (Prt ) Us writtn mtho to sutrt rom iit numrs (Prt ) Us writtn mtho to sutrt rom iit numrs (Prt ) Us writtn mtho to sutrt rom iit numrs (Prt ) Sutrt imls rom (Prt ) Sutrt imls rom (Prt ) Sutrt imls rom Sutrt imls rom ny iit numr Sutrt imls low (not riin th ons ounry) Sutrt imls low (riin th ons ounry) Sutrt imls rom ny iit numr Us writtn mtho to sutrt imls ( iml pl) Us writtn mtho to sutrt imls ( n iml pls) Us writtn mtho to sutrt imls ( iml pls) Us writtn mtho to sutrt imls ( iml pls) Us writtn mtho to sutrt imls ( iml pls) Us th invrs to in missin iml numrs (Prt ) Us th invrs to in missin iml numrs (Prt ) Sutrt rms n rms Sutrt kilorms n rms (onvrt kilorms to rms) Sutrt ntimtrs n ntimtrs Sutrt mtrs n ntimtrs (onvrt mtrs to ntimtrs) Fin hn rom. Fin hn rom. Fin hn rom. Fin hn rom othr mounts o whol pouns Sutrt p y rounin up n ompnstin Sutrt y rounin up n ompnstin (p n p) Us writtn mtho to sutrt mony Us writtn mtho to sutrt lrr mounts o mony (Prt ) Us writtn mtho to sutrt lrr mounts o mony (Prt ) Us writtn mtho to sutrt numrs with vryin iml pls Sutrt lrr numr rom smllr numr (tmprtur) Sutrt lrr numr rom smllr numr NUMBER LINES NUMBER SQUARE THE WRITTEN COLUMN METHOD OF SUBTRACTION ANSWERS THE SUBTRACTION BOOK Copyriht HStrt Primry Lt

6 OBJECTIVE Sutrt numrs rom (numr ons to ) Nm Yr/Clss Mk sur you know your numr ons to. I it hlps, try usin ountrs. Copyriht HStrt Primry Lt Sor... Tim...

7 OBJECTIVE Sutrt ny numrs low Nm Yr/Clss Try usin numr lin or rulr. You n in numr lin on p. Copyriht HStrt Primry Lt Sor... Tim...

8 Copyriht HStrt Primry Lt Sutrt numrs rom Rmmr to us your knowl o numr ons. Nm Yr/Clss OBJECTIVE Sor... Tim...

9 THE WRITTEN COLUMN METHOD OF SUBTRACTION Th olumn mtho o sutrtion is th most wily us wy to sutrt numrs on ppr. Position th lrr numr ov th smllr numr with th pl vlu olumns (ons, tns, t.) lin up orrtly. Strt in th ons (units) olumn on th riht n work rom riht to lt sutrtin th iits. For xmpl, th lultion woul on lik this: STEP STEP Hr s how to o tk wys! Whn sttin out, writ th lrr numr on top. Th ons (units) n th tns must lin up rully in olumns. Strt with th olumn urthst to th riht, whih is th ons olumn. Tk th ottom iit () rom th top on () to t th nswr (). Copyriht HStrt Primry Lt

10 STEP Now omplt th lultion y sutrtin th iits on th ottom rom thos on th top. Strt on th riht in th ons olumn. So, Ths mthos work or numrs o ny siz! To sutrt numrs with irnt mounts o iml pls, hk out th xmpl low. For xmpl, th lultion.. woul on lik this:... First o ll, lin up th iml points. Put zros to ill th sps to th riht o th in th top numr. This mks th lultion lrr. Copyriht HStrt Primry Lt

11 Lik wht you v sn so r? Rqust your riskr insption opis. W will ispth your opis within hours y nxt y ourir. I you lov your rsours, kp thm n w will pross your orr n sn th ompnyin CDROMs. I you r not stisi, lt us know n w will rrn to ollt thm rom you rohr. W r hr to hlp. I you hv ny qustions rrin our rsours or orrin pross, pls on t hsitt to t in touh with us. Emil: ino@hstrtprimry.om Phon:

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