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