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Adjusting numbers in a problem to make mental math easier - PowerPoint PPT Presentation


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COMPATIBLE NUMBERS. Adjusting numbers in a problem to make mental math easier. Example Tell the sum of the following group of numbers. 4 + 9 + 7 + 3 + 11 + 1 + 6. 4 + 9 + 7 + 3 + 11 + 1 + 6. How can we easily add these numbers?. Can you find groups of ten?

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Presentation Transcript
slide1

COMPATIBLE NUMBERS

Adjusting numbers

in a problem

to make

mental math

easier

slide2
Example

Tell the sum of the following group of numbers.

4 + 9 + 7 + 3 + 11 + 1 + 6

4 9 7 3 11 1 6
4 + 9 + 7 + 3 + 11 + 1 + 6

How can we easily add these numbers?

slide4

Can you find groups of ten?

4 + 9 + 7 + 3 + 11 + 1 + 6

7+3 = 10

6+4 = 10

9+1 = 10

plus 11

Count

10, 20, 30, 40, 41

slide5

Can you find groups of ten?

5 + 4 + 12 + 9 + 1 + 6 + 5

9+1 = 10

5+5 = 10

6+4 = 10

plus 12

Count

10, 20, 30, 40, 42

slide6
43 +68

40 + 3

60 + 8

43 ~ 40

68 ~ 70

100 + 11

~ 110

Exact Answer

Estimate

slide7

80

What number is compatible with 79?

65

What number is compatible with 66?

75

What number is compatible with 74?

90

What number is compatible with 92?

85

What number is compatible with 86?

slide8

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

slide9

Which number sentence best uses compatible numbers to estimate the difference?

  • 58 - 39 = 19
  • 60 – 40 = 20 C. 68 – 48 = 20
  • 55 – 40 = 15 D. 75 – 50 = 25
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COMPATIBLE NUMBERS

  • Which number sentence best uses compatible numbers to estimate the difference?
  • 76 –39 = 37
  • 60 – 50 = 10 C. 80 – 40 = 40
  • 70 – 40 = 30 D. 75 – 50 = 25
slide11

Which number sentence best uses compatible numbers to estimate the sum?

  • 88 + 68 = 156
  • 90 + 70 =160 C. 95 + 60 = 155
  • B. 95 + 65 =160 D. 90 + 65 = 155
slide12

Which number sentence best uses compatible numbers to estimate the sum?

  • 94 + 61 = 155
  • 90 + 70 =10 C. 95 + 60 = 155
  • B. 95 + 65 =160 D. 90 + 65 = 155
slide13

COMPATIBLE NUMBERS

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