Workbook Detail
Subtraction Within 20 Hard — Set 81
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"question": "15 - 3 = ___",
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"question": "5 - 2 = ___",
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"id": 18,
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"id": 19,
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"question": "6 - 5 = ___",
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{
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"question": "16 - 2 = ___",
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}Teaching Notes
8
-2
16
-6
8
-5
3
-1
13
-12
9
-1
3
-2
2
-1
15
-3
16
-2
2
-1
18
-14
3
-2
5
-2
3
-2
9
-2
6
-3
14
-13
6
-5
16
-2
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