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