Oefen met erbij en eraf tot 100
In de mix
1.
70
10
+
=
2.
40
20
–
=
3.
60
20
+
=
4.
100
30
–
=
5.
30
20
–
=
6.
10
10
+
=
7.
100
80
–
=
8.
50
30
–
=
9.
20
50
+
=
10.
50
40
–
=
11.
60
20
–
=
12.
40
20
–
=
13.
50
10
+
=
14.
100
70
–
=
15.
40
10
+
=
16.
20
0
+
=
17.
70
30
+
=
18.
30
20
–
=
19.
60
50
–
=
20.
50
10
+
=
21.
20
40
+
=
22.
70
40
–
=
23.
100
60
–
=
24.
80
30
–
=