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