Brain teasers

22nd January 1999 at 00:00
MATHS CHALLENGE. Puzzles to test mathematical skills.

AGE 5-6 Pick two

8 2 1 4

Pick 2 of these numbers. Add them together. Write the answer.

Keep picking two numbers and adding them together.

How many different answers can you get?

Now do it subtracting one number from another.How many different answers can you get?

Put counters on the grid. You can put only one in each space.

AGE 7-9 Odds and evens (You will need 13 counters or coins)

Draw this grid.

1) Place 13 counters on the grid.

Make sure you get an odd number of them in each row and column and in the two main diagonals.

2) Place 10 counters on the grid.

Make sure you get an even number of them in each row and column and in the two main diagonals.

* BRAIN TEASER SOLUTIONS (page 54)

Pick two: There are 6 different sums and 6 different (positive) differences.

1 + 2 = 3 2 - 1 = 1 1 + 4 = 5 4 - 2 = 2

2 + 4 = 6 4 - 1 = 3 1 + 8 = 9 8 - 4 = 4

2 + 8 = 10 8 - 2 = 6 4 + 8 = 12 8 - 1 = 7

The puzzle can be adapted for older children by using larger numbers.

Odds and Evens: For example: (picture of grid not available on database) Other solutions are possible.

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