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