Oefen optellen met gemengde oefeningstypes!
- Question 1: blank plus 1 equals 3.
- Question 2: 4 plus 2 equals blank.
- Question 3: blank plus 4 equals 7.
- Question 4: blank plus 5 equals 9.
- Question 5: blank plus 3 equals 7.
- Question 6: 3 plus 1 equals blank.
