Reken de erafsommen tot 20 uit
Erafsommen
|
1.
20 – 4 =
4
16
|
2.
16 – 12 =
4
9
|
3.
15 – 1 =
14
12
|
4.
20 – 6 =
8
14
|
|
5.
13 – 8 =
5
9
|
6.
1 – 0 =
1
6
|
7.
7 – 1 =
4
6
|
8.
12 – 4 =
8
11
|
|
9.
1 – 1 =
4
0
|
10.
9 – 8 =
1
4
|
11.
15 – 0 =
12
15
|
12.
18 – 0 =
18
23
|
|
13.
5 – 5 =
5
0
|
14.
7 – 4 =
3
1
|
15.
3 – 0 =
3
5
|
16.
19 – 6 =
13
10
|
|
17.
2 – 2 =
0
5
|
18.
1 – 0 =
1
4
|
19.
12 – 5 =
1
7
|
20.
13 – 7 =
11
6
|