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