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