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