Simple Calculation.

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Presentation transcript:

Simple Calculation

Operation Properties Commutative law of addition a+b=b+a Commutative law of multiplication Associative law of addition Associative law of multiplication Property of division Distributive law of multiplication a+b=b+a a×b=b×a (a+b)+c=a+(b+c) (a×b)×c=a×(b×c) a÷b÷c=a÷ (b×c) (b and c ≠ 0) (a+b)×c=a×c+b×c

Fill in the brackets （1）5600÷（56×25）＝ 5600 56 25 （2）（10+7）×9= ×9+ ×9 （3） 18 + 64 +82=64 +（ + ）（4） 125 × 9 × 8= × ×9 （5）37×24-37×4=37×（－） ÷ ÷ 10 7 18 82 125 8 24 4

True or False? （1）7200÷24÷3 = 7200÷（24×3）（）（2）246÷6 = 246÷2÷3 （）（3）125×71×8 = (125×8)×(71×8) （） √ √ 246÷（2×3） × 125×8× 7

Choose (1)Which answer is the same with 24×12+24 A)24×（12+24） B)24×12+24×24 C)24×（12+1） ×1

Fill in the bracket （A+B）×C=28，B×C=7 A×C=( ) （A+B）×C= 28 A ×C+B ×C= 28 21 7

BOYS: GIRLS： 100+100= 49+57= 600-300= 124-76= 30 + 40 = 36+48= 200 106 300 48 84 70

Make tens 10 1 9 2 8 3 7 4 6 5 5

Game I say “1” You say “9”

10 5 + 7 + 5 = 17 10 19 4 + 6 + 9 = 20 2 + 13 + 7 = 22 20 1 + 10 + 19 = 30 30 22 + 14 + 8 = 44

Make hundreds 9 10 3 9 10 6 1 +（） 1 0 0 1 2 8 + （） 4 0 0 3 9 2 7 2 7 9 10 3 4 5 +（） 8 0 0 4 5 5

Make hundreds 159－（）=100 126－（）=100 218－（）=200 633－（）=600 879－（）=800 59 26 18 33 79

Make hundreds 25×4=100 100÷4=25 50×2=100 100÷25=4 125×8=1000 1000÷8=125

Can we calculate the following simply? 500 √ (1) 155 + 846 + 345 ( ) 100 √ (2) 25×8×4 ( ) x (3) 117 + 484 + 329 ( ) √ (4) 36×101 ( ) =36×(100+1) =36×100+36×1

139+239+261 (2) 139+239+261 =139+(239+261) =139+500 =639 (1) 139+239+261 =(139+261)+239 =400+239 =639

25×32 (2) 25×32 (1) 25×32 =25×（30+2） =25×（4×8） =25 × 30+25 × 2 =750+50 =800 (1) 25×32 =25×（4×8） =（25×4）×8 =100×8 =800

54×28＋46×71 Change a number in order to simply calculate 54×28＋46×28 54×71＋46×71 46×28＋46×71