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