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