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