Math Riddles

What’s inside

• What number comes next in the sequence 2, 6, 12, 20, 30, ...?
• A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
• What is the smaller angle between the hands of a clock at exactly 3:15?
• Three consecutive integers have a sum of 72. What is the largest integer?
• A two-digit number has digits that add up to 9. Reversing its digits increases the number by 27. What is the original…
• A father is twice as old as his son. Twelve years ago, he was three times as old as his son. How old is the son now?
• A perfect square is odd if and only if its square root is odd.
• If 5 machines make 5 items in 5 minutes, then 100 machines make 100 items in 100 minutes.