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