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