Oefen de erbijsommen tot 20

Erbijsommen
1.
2 + 3 =
1
5
2
9
2.
1 + 4 =
9
3
6
5
3.
16 + 3 =
13
9
12
19
4.
1 + 17 =
5
7
11
18
5.
9 + 5 =
1
14
10
13
6.
5 + 0 =
5
6
7
2
7.
7 + 13 =
20
7
15
10
8.
20 + 0 =
5
20
6
12
9.
7 + 12 =
8
19
9
12
10.
9 + 3 =
8
6
12
3
11.
14 + 5 =
12
14
10
19
12.
2 + 15 =
11
6
12
17
13.
17 + 1 =
6
7
9
18
14.
2 + 5 =
11
3
7
5
15.
15 + 2 =
11
17
9
12
16.
9 + 2 =
7
14
1
11
17.
12 + 6 =
8
3
6
18
18.
7 + 11 =
18
8
12
9
19.
12 + 8 =
13
20
4
14
20.
15 + 5 =
14
3
13
20

Oefen de erbijsommen tot 20
| ANTWOORDEN

Erbijsommen
1.
2 + 3 =
1
5
2
9
2.
1 + 4 =
9
3
6
5
3.
16 + 3 =
13
9
12
19
4.
1 + 17 =
5
7
11
18
5.
9 + 5 =
1
14
10
13
6.
5 + 0 =
5
6
7
2
7.
7 + 13 =
20
7
15
10
8.
20 + 0 =
5
20
6
12
9.
7 + 12 =
8
19
9
12
10.
9 + 3 =
8
6
12
3
11.
14 + 5 =
12
14
10
19
12.
2 + 15 =
11
6
12
17
13.
17 + 1 =
6
7
9
18
14.
2 + 5 =
11
3
7
5
15.
15 + 2 =
11
17
9
12
16.
9 + 2 =
7
14
1
11
17.
12 + 6 =
8
3
6
18
18.
7 + 11 =
18
8
12
9
19.
12 + 8 =
13
20
4
14
20.
15 + 5 =
14
3
13
20