21st September 2001 at 01:00
Puzzles to test mathematical skills

AGE 5-7: TRACINGS: Try to draw each of these without taking your pencil from the paper or going over any line twice. In one diagram you cannot do this. Which one is it?

AGE 8-11: UPSIDE-DOWN NUMBERS: These four-digit numbers are the same when you look at the page upside down: 1961 6119 6969

What are the next six four-digit numbers after 6969 that have this property? How many upside-down numbers are there between 10000 and 20000?

Answers (on page 63): Tracings: Diagram 5 is the odd one out.

Upside-down numbers: The next upside-down number is 8008, then 8118, 8698, 8888,8968, 9006

There are 15 upside-down numbers between 10000 and 20000: 10001, 10101, 10801, 11011, 11111, 11811, 16091, 16191, 16891, 18081, 18181, 18881, 19061, 19161, 19861

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