From the whole numbers 1 to 100, how many cannot be divided by 6 or 9?
Model using a Venn diagram. The numbers fall into
(a) multiples of 6
(b) multiples of 9
(c) multiples of 6 and 9
(a) multiples of 6
(b) multiples of 9
(c) multiples of 6 and 9