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