I am a number with four digits. My thousands digit is 1, and every subsequent digit is twice the digit that came immediately before it. What number am I?
1248
Thousands = 1. Hundreds = 1*2 = 2. Tens = 2*2 = 4. Units = 4*2 = 8. The number is 1248.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
More math riddles
Ben has 17 bees and Ida has 7. How many more bees does Ben have?
A train travels 60 miles in one hour. For the first half hour, it travels at 40 miles per hour. How fast must it travel during the second half hour?
I am a two-digit number whose tens digit is one greater than my units digit. When you square me, my last two digits reproduce me exactly. What number am I?
24 sleds are shared equally among 4 friends. How many sleds does each friend get?
Which three distinct positive integers give the exact same result whether you add them together or multiply them together?
There are 23 ice cream cones in a box and 5 are taken out. How many ice cream cones are left?