Subtraction Tricks by E' Morton

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Subtraction TricksbyE. Morton
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Subtracting Across Zeros

• 3 0 2
• 1 9 8

3
1st-- borrow 1 from 30

• 3 0 2
• 1 9 8

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2nd cross out the 30

• 3 0 2
• 1 9 8

5
3rd write 29 above the 30
2 9

• 3 0 2
• 1 9 8

6
4th Write a 1 in front of the 2
2 9

• 3 0 2
• 1 9 8

1
7
5th Subtract 8 from 12
2 9

• 3 0 2
• 1 9 8

1
4
8
6th Subtract 9 from 9
2 9

• 3 0 2
• 1 9 8

1
4
0
9
7th Subtract 1 from 2
2 9

• 3 0 2
• 1 9 8

1
4
0
1
10
Now youre finished!
2 9

• 3 0 2
• 1 9 8

1
4
0
1
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Second example

• 8 0 0 2
• 3 7 6 5

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1st Borrow 1 from 800

• 8 0 0 2
• 3 7 6 5

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2nde cross out the 800

• 8 0 0 2
• 3 7 6 5

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3rd write 799 above the 800
7 9 9

• 8 0 0 2
• 3 7 6 5

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4th write a 1 next to the 2
7 9 9

• 8 0 0 2
• 3 7 6 5

1
16
5th--subtract 5 from the 12
7 9 9

• 8 0 0 2
• 3 7 6 5

1
7
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6th subtract 6 from the 9
7 9 9

• 8 0 0 2
• 3 7 6 5

1
7
3
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7th subtract 6 from the 9
7 9 9

• 8 0 0 2
• 3 7 6 5

1
7
3
2
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8th subtract 3 from the 7
7 9 9

• 8 0 0 2
• 3 7 6 5

1
7
3
2
4
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Youre finished!
7 9 9

• 8 0 0 2
• 3 7 6 5

1
7
3
2
4
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Try it alone--
6 9 9

• 7 0 0 5
• 2 8 3 6

1
9
6
1
4
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Now, Again
8 9 9

• 9 0 0 4
• 7 9 5 6

1
8
4
0
1
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Dont subtract the top number from the bottom
number

• 6 1 3
• 2 7 9

4 6 6
Or youll be WRONG!.
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Never borrow unless you need to!
5

• 9 6 2
• 8 4 1

1
Your answer will always be wrong.
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Practice these subtraction facts
9
13

• 18 9
• 18 7
• 16 8
• 14 8
• 12 9
• 11 3
• 15 7
• 9 3

• 18 5
• 18 3
• 16 7
• 14 6
• 12 4
• 11 7
• 15 6
• 9 5

11
15
8
9
6
8
3
8
8
4
8
9
6
4