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