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