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