1.
20 + 0 =
20
4
3
2
|
2.
12 – 7 =
2
5
3
1
|
3.
4 + 6 =
3
10
2
1
|
4.
20 – 1 =
3
19
4
2
|
5.
4 + 15 =
4
3
2
19
|
6.
19 – 4 =
2
3
1
15
|
7.
19 – 18 =
3
1
4
2
|
8.
10 – 7 =
2
3
4
1
|
9.
9 – 2 =
1
3
7
2
|
10.
15 – 13 =
3
2
1
4
|
11.
5 + 5 =
10
1
3
2
|
12.
2 – 1 =
4
1
2
3
|
13.
7 – 3 =
2
1
3
4
|
14.
20 – 4 =
4
3
2
16
|
15.
10 – 6 =
3
4
2
1
|
16.
10 – 8 =
1
2
3
4
|
17.
14 + 3 =
4
3
17
2
|
18.
11 – 0 =
3
2
1
11
|
19.
16 + 3 =
19
4
2
3
|
20.
1 + 10 =
1
2
3
11
|
1.
20 + 0 =
20
4
3
2
|
2.
12 – 7 =
2
5
3
1
|
3.
4 + 6 =
3
10
2
1
|
4.
20 – 1 =
3
19
4
2
|
5.
4 + 15 =
4
3
2
19
|
6.
19 – 4 =
2
3
1
15
|
7.
19 – 18 =
3
1
4
2
|
8.
10 – 7 =
2
3
4
1
|
9.
9 – 2 =
1
3
7
2
|
10.
15 – 13 =
3
2
1
4
|
11.
5 + 5 =
10
1
3
2
|
12.
2 – 1 =
4
1
2
3
|
13.
7 – 3 =
2
1
3
4
|
14.
20 – 4 =
4
3
2
16
|
15.
10 – 6 =
3
4
2
1
|
16.
10 – 8 =
1
2
3
4
|
17.
14 + 3 =
4
3
17
2
|
18.
11 – 0 =
3
2
1
11
|
19.
16 + 3 =
19
4
2
3
|
20.
1 + 10 =
1
2
3
11
|