顧卿璇

Maths Riddles is a game of puzzles， which is designed toimprove students logical thinking ability and knowledge of maths.The maths games can not only challenge students lateral thinking，but also test their logic and calculation skills.

A lot of researches show that maths games help to train bothsides of your brain. Brain games help students to overwhelminglyboost their brain power， and logical puzzles increases studentslogical thinking power. Also， more and more maths teachersbelieve that arithmetic puzzles enhances students knowledge inalgebra， while geometry puzzles enhances and unlocks their brainpower to solve geometric riddles.

Here are a set of math puzzles and the difficulty increases.Would you please make the most out of your free time with mathriddles and puzzles？ Try！

1. How do you make the number “7” even withoutaddition， subtraction， multiplication， or division？

2. How many times can you subtract the number “5”from “25” ？

3. When John was six years old， he hammered a nailinto his favorite tree to mark his height. Ten years later at age

sixteen， John returned to see how much higher the nail was. If the tree grew by f ive centimeters each year， how much higher would the nail be？

4. I am four times as old as my daughter. In 20 years， I shall be twice as old as her. How old are we now？

5. Which is heavier， 1 ton of stones or 1 ton of feathers？

6. Two fathers， two sons and a grandfather went to watch a movie. One ticket for the movie is 6 dollars， but they only paid 18 dollars. How could that be？

7. The price of eggs is $ 0.12 a dozen. How many eggs are half a dollar？

8. Multiplying this number by any other number， the answer will be always the same. What is this number？

9. What is the missing number in this pattern？32，16，________，4，2，1

10. What is the missing number in this pattern？0，7，26，63，124，________

（參考答案見本期第72頁）