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