subtraction using a number line
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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
![Page 3: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/3.jpg)
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:
![Page 4: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/4.jpg)
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:
![Page 5: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/5.jpg)
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:
![Page 6: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/6.jpg)
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:
![Page 7: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/7.jpg)
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:
![Page 8: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/8.jpg)
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:
![Page 9: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/9.jpg)
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
![Page 10: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/10.jpg)
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
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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
![Page 12: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/12.jpg)
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
![Page 13: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/13.jpg)
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:
![Page 14: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/14.jpg)
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:
![Page 15: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/15.jpg)
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:
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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:
![Page 17: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/17.jpg)
+ 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:
![Page 18: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/18.jpg)
+ 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:
![Page 19: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/19.jpg)
+ 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:
![Page 20: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/20.jpg)
+ 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:
![Page 21: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/21.jpg)
+ 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:
![Page 22: Subtraction Using A Number Line](https://reader036.vdocuments.us/reader036/viewer/2022062319/55882ec3d8b42a9b0e8b46bd/html5/thumbnails/22.jpg)
That’s it for now......
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mastering multiplication tableson amazon.com