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