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