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