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