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