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