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