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