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