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