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