Adjusting numbers in a problem in a problem to make to make mental math easier easier.

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Presentation transcript:

Adjusting numbers in a problem in a problem to make to make mental math easier easier

Example Tell the sum of the following group of numbers

How can we easily add these numbers?

Can you find groups of ten? = = =10 plus11 Count 10, 20, 30, 40, 41

Can you find groups of ten? = = =10 plus12 Count 10, 20, 30, 40, 42

~ ~ ~ 110

What number is compatible with 79 ? What number is compatible with 66 ? What number is compatible with 74 ? What number is compatible with 92 ? What number is compatible with 86 ?

Which number sentence best uses compatible numbers to estimate the difference? 72 – 43 = 29 A. 60 – 50 = 10 B. 70 – 40 = 30 C. 80 – 40 = 40 D. 75 – 50 = 25

Which number sentence best uses compatible numbers to estimate the difference? = 19 A.60 – 40 = 20C. 68 – 48 = 20 B.55 – 40 = 15D. 75 – 50 = 25

Which number sentence best uses compatible numbers to estimate the difference? 76 –39 = 37 A.60 – 50 = 10C. 80 – 40 = 40 B.70 – 40 = 30D. 75 – 50 = 25

Which number sentence best uses compatible numbers to estimate the sum? = 156 A =160C = 155 B =160D = 155

Which number sentence best uses compatible numbers to estimate the sum? = 155 A =10 C = 155 B =160D = 155

Which number sentence best uses compatible numbers to estimate the difference? 78 – 43 = 29 A.60 – 50 = 10C. 80 – 40 = 40 B.70 – 40 = 30D. 75 – 50 = 25