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