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