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