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