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