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