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