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