Answer: 270
Explanation:
First, list all the numbers that both 6 and 9 can divide that are under 100. You do this by listing the multiples of both numbers under 100.
Multiples of 6 ⇒ 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, and 96.
Multiples of 9 ⇒ 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, and 99.
From the above, the numbers that can be divided by both are; 18, 36, 54, 72 and 90
Adding these numbers up will give;
= 18 + 36 + 54 + 72 + 90
= 270