| Subtraction over 10 | Subtraction over 20 | Addition over 10 | Addition over 20 |
|---|---|---|---|
|
10
18-8
|
30
40-10
|
15
10+5
|
25
20+5
|
|
9
19-10
|
35
55-20
|
15
7+8
|
45
20+25
|
|
3
18-5
|
40
80-40
|
19
15+4
|
33
33+30
|
|
8
17-9
|
43
65-22
|
13
6+7
|
4865
23+42
|
|
8
15-7
|
56
78-24
|
19
13+6
|
84
65+19
|
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