Facts
easy
medium
harder
hardest
100
The answer when 2 "neighbors" are subtracted
One
100
9 - 4 =
5
100

25 - 11 =14

14

100
42 - 38 =
4
100
602 - 368 =
234
200
The answer when 2 numbers that are the same are subtracted
Zero
200
10 - 2 =
8
200
38 - 22 =
16
200
56 - 49 =
7
200
700 - 99 =
601
300
The correct way to subtract is top to bottom or bottom to top.
bottom to top
300
4 - 1 =
3
300
98 - 65 =
33
300
532 - 118 =
414
300
$34.92 - $2.31 =
$32.61
400
When do you have to borrow in subtraction?
When the top number is too small.
400
6 - 6 =
0
400

456 - 231 =225

225

400
623 - 45 =
578
400
701 - 58 =
643
500
What you have to do when you borrow but the neighbor is a zero.
Borrow from the 2 nighbors together.
500
9 - 8 =
1
500
899 - 788 =
111
500
234 - 95 =
139
500
$22.55 - $13.77 =
$8.78
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