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