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