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