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