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