Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
MathsMemoryCards Set15- Negativenumbers Negativenumbers are… Numbersgetlower thefurther… Sometimesnegative numbersarewritten… We don’tusethe word… Negative numbers Whenyoumultiply or (thoselessthanzero) divide apositive areshownusinga‘–’ numberby apositive sign.Positive number… numbers… Whenyoumultiply or Whenyoumultiply or divide apositive divide anegative numberby anegative numberby apositive number… number… ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers …leftyoumovedown thenumber line.-5is …thoselessthanzero lowerthan-2 onthenumberline Lower -5 Higher -4 -3 -2 -1 0 1 2 …’minus’. Weusetheword …in brackets.This ‘negative’instead.The doesn’tchangethe number3below0is ’negativethree’,not‘minus number.-3and(-3) arethesamenumber three’ …yougetapositive answer. 3X4=12 30÷ 6=5 …arethoseabovezero. Usuallywedon’tusea‘+’ signtoshowtheyare positive.Wejustwritethe number,but+3and3are thesamenumber …yougetanegative answer. …yougetanegative answer. -3X4=-12 -30÷ 6=-5 3X-4=-12 30÷ -6=-5 ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers Whenyoumultiply or divide anegative numberby anegative number… 3+2 =? -2+5 =? -4+3 =? 5−3 =? 3−4 =? -2−3 =? Adding anegative number… ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers 3+2 =5 Startat3,moveup thenumberline2 -1 0 1 2 3 4 5 …yougetapositive answer. 6 -4+3 =-1 Startat-4,moveup thenumberline3 -5 -4 -3 -2 -1 0 1 -3X-4=12 -30÷ -6=5 2 -2+5 =3 Startat-2,moveup thenumberline5 -3 -2 -1 0 1 2 3 4 3−4 =-1 5−3 =2 Startat3,movedown Startat5,movedown thenumberline4 thenumberline3 -2 -1 0 1 2 3 4 5 1 0 1 2 3 4 5 6 …isthesameasdoing -2−3 =-5 Startat-2,movedown the asubtraction. numberline3 3+-2 isequivalentto 3− 2 -6 -5 -4 -3 -2 -1 0 1 ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers Subtracting anegative number… 3+-2 =? 5+-7 =? -4+-3 =? 5−-3 =? -3−-4 =? -5−-3 =? Squaring anegative number… ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers 3+-2 …isthesameasdoing isequivalentto anaddition. 3− 2=1 3− -2 Startat3,movedown isequivalentto thenumberline2 3+ 2 5+-7 -4+ -3 is equivalentto isequivalentto -4− 3=-7 5− 7=-2 Startat-4,movedown the Startat5,movedown numberline3 thenumberline7 -3−-4 is equivalentto -3+ 4=1 Startat-3,moveup thenumberline4 5−-3 is equivalentto 5+ 3=8 Startat5,moveup thenumberline3 …givesapositive answer. (-3)2 =-3× - 3=9 -5−-3 isequivalentto -5+ 3=-2 Startat-5,moveup thenumberline3 ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers It isnot possible… Saythiscalculation outloudthenanswer it: 3× -2 Saythiscalculation Saythiscalculation outloudthenanswer outloudthenanswer it: it: -6÷ -2 -4+2 Saythiscalculation Saythiscalculation outloudthenanswer outloudthenanswer it: it: -4−2 -3+-5 Saythiscalculation Saythiscalculation outloudthenanswer outloudthenanswer it: it: -5−-2 (-4)2 ©2017GreatMathsTeachingIdeas AllRights Reserved MathsMemoryCards Set15- Negativenumbers ’Threetimes negative twoequalsnegative six’ …to squareroot a negativenumberand getareal number answer ‘Negative fouradd twoequalsnegative two’ ‘Negative sixdivided bynegative two equals(positive) three’ ‘Negative threeadd negative fiveequals negative eight’ ‘Negative four subtract twoequals negative six’ ‘Negative four squared equals (positive)sixteen’ ‘Negative fivesubtract negative twoequals negative three’ ©2017GreatMathsTeachingIdeas AllRights Reserved