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