Subtraction Using A Number Line

Subtraction Of Whole Numbers Using A Number Line

(the 1st step towards using a standard written method for subtraction)

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A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

To “Count Back” you need to subtract from the larger number to the smaller number in stages:

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

10 16

- 6To “Count Back” you need to subtract from the larger number to the smaller number in stages:

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

9 10 16

- 1 - 6To “Count Back” you need to subtract from the larger number to the smaller number in stages:

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

9 10 16

- 1 - 6To “Count Back” you need to subtract from the larger number to the smaller number in stages:

To “Count On” you need to add on from the smaller number to the larger number in stages:

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

9 10 16

- 1 - 6To “Count Back” you need to subtract from the larger number to the smaller number in stages:

7 10

+ 3To “Count On” you need to add on from the smaller number to the larger number in stages:

A number line can be used to record the stages of a subtraction question in 2 different ways. You can either use it to “count back” or use it to “count on”. For example: 16 - 7 = 9

9 10 16

- 1 - 6To “Count Back” you need to subtract from the larger number to the smaller number in stages:

7 10 16

+ 3 + 6To “Count On” you need to add on from the smaller number to the larger number in stages:

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens: 80 86

- 6

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens: 79 80

- 1

86

- 6

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens:

- 40

39 79 80

- 1

86

- 6

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens:

- 40

39 79 80

- 1

86

- 6

- 40

8646

“Counting Back” subtracting the tens first, followed by the units:

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens:

- 40

39 79 80

- 1

86

- 6

- 6 - 40

40 8646

“Counting Back” subtracting the tens first, followed by the units:

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting Back” subtracting the units first, followed by the tens:

- 40

39 79 80

- 1

86

- 6

- 6 - 40

39 40 86

- 1

46

“Counting Back” subtracting the tens first, followed by the units:

47 50

+ 3

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 6

47 50

+ 3

56

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 6 + 30

47 50 86

+ 3

56

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 6 + 30

47 50 86

+ 3

56

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 30

47 77

“Counting On” adding on the tens first, followed by the units:

+ 6 + 30

47 50 86

+ 3

56

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 30

47 77

+ 3

80

“Counting On” adding on the tens first, followed by the units:

+ 6 + 30

47 50 86

+ 3

56

When working with bigger numbers, you can either work with the tens first, followed by the units or work with the units first, followed by the tens .For example: 86 - 47 = 39

“Counting On” adding on the units first, followed by the tens:

+ 6+ 30

47 77 86

+ 3

80

“Counting On” adding on the tens first, followed by the units:

That’s it for now......

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