Reken de erafsommen tot 20 uit
Erafsommen
|
1.
17 – 5 =
12
16
|
2.
14 – 3 =
8
11
|
3.
10 – 5 =
1
5
|
4.
1 – 0 =
4
1
|
|
5.
7 – 3 =
4
6
|
6.
15 – 4 =
10
11
|
7.
6 – 2 =
7
4
|
8.
20 – 7 =
13
9
|
|
9.
5 – 3 =
1
2
|
10.
2 – 2 =
5
0
|
11.
4 – 0 =
4
8
|
12.
13 – 0 =
2
13
|
|
13.
12 – 12 =
1
0
|
14.
3 – 1 =
3
2
|
15.
9 – 7 =
1
2
|
16.
4 – 2 =
6
2
|
|
17.
20 – 0 =
20
25
|
18.
14 – 6 =
4
8
|
19.
9 – 5 =
6
4
|
20.
4 – 3 =
1
6
|