Oefen met erbij en eraf tot 100
In de mix
1.
10
10
+
=
2.
30
20
–
=
3.
30
10
+
=
4.
100
50
–
=
5.
60
20
+
=
6.
10
10
+
=
7.
100
20
–
=
8.
20
10
+
=
9.
30
50
+
=
10.
80
50
–
=
11.
50
30
+
=
12.
30
20
–
=
13.
20
0
+
=
14.
80
30
–
=
15.
30
20
–
=
16.
100
50
–
=
17.
90
30
–
=
18.
80
70
–
=
19.
40
20
–
=
20.
100
50
–
=
21.
90
40
–
=
22.
60
20
–
=
23.
20
10
+
=
24.
20
10
+
=