Oefen de erbijsom en erafsom tot 20
In de mix
|
1.
17 – 14 =
3
1
|
2.
6 + 6 =
12
1
|
3.
16 + 2 =
18
2
|
4.
9 + 7 =
2
16
|
|
5.
3 + 14 =
2
17
|
6.
11 + 7 =
18
2
|
7.
20 – 10 =
10
1
|
8.
8 – 4 =
4
1
|
|
9.
5 – 2 =
1
3
|
10.
8 + 6 =
1
14
|
11.
9 – 3 =
1
6
|
12.
14 – 14 =
0
2
|
|
13.
10 – 5 =
5
1
|
14.
17 + 1 =
18
2
|
15.
9 + 9 =
2
18
|
16.
19 + 0 =
2
19
|
|
17.
20 + 0 =
2
20
|
18.
3 – 0 =
3
1
|
19.
16 + 4 =
2
20
|
20.
17 – 12 =
1
5
|