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