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