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