A pizza has 8 slices. You eat half of them, then half of what's left, then half of what's left again. How many slices remain?
Hint: Keep cutting the number in half.
Answer
One slice
8 becomes 4, then 2, then 1.
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How many times can you subtract 5 from 25?
Hint: What's left after the first time?
Answer
Just once
After you subtract 5 once, you're subtracting from 20, not 25.
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If 3 cats catch 3 mice in 3 minutes, how many cats would it take to catch 100 mice in 100 minutes?
Hint: Work out how long one cat takes for one mouse.
Answer
Three cats
Each cat catches one mouse every 3 minutes, so 3 cats catch 100 mice in 100 minutes.
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What's half of two plus two?
Answer
Three
Half of two is one, and one plus two is three.
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A doctor gives you three pills and tells you to take one every half hour. How long will they last?
Hint: You take the first one right away.
Answer
One hour
You take one now, one at 30 minutes and the last at 60 minutes.
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I'm a single digit. Turn me upside down and I'm worth three more. What number am I?
Hint: Picture me on a calculator.
Answer
Six
A 6 turned upside down becomes a 9, which is three more.
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A rope ladder hangs off the side of a boat with four rungs underwater. The tide rises two feet. How many rungs are underwater now?
Hint: What happens to the boat?
Answer
Still four
The boat floats, so it rises with the tide, and the ladder rises with it.
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Lily pads on a pond double in size every day. On day 48, the pond is completely covered. On which day was it half covered?
Hint: Work backward one day.
Answer
Day 47
If the pads double daily, the pond was half covered the day before it was full.
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How many times does the digit 9 appear in the numbers from 1 to 100?
Hint: Don't forget the 90s.
Answer
20 times
9 appears in the ones place 10 times (9, 19… 99) and in the tens place 10 times (90–99).
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When does 9 + 5 equal 2?
Answer
On a clock
Five hours after 9 o'clock is 2 o'clock.
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I'm a three-digit number. My tens digit is 5 more than my ones digit, and my hundreds digit is 8 less than my tens digit. What number am I?
Hint: My tens digit must be big.
Answer
194
The tens digit has to be 9 (so the hundreds can be 1), which makes the ones digit 4.
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What do you get if you add 2 to 200 four times?
Hint: Read it very literally.
Answer
202, four times
Adding 2 to 200 gives 202 every time you do it.
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