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