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