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problem

Adding in pairs

11 to 14

These are the results when 3 numbers were added in pairs. What were the numbers?

problem

Adding machine

16 to 18

Can you set the logic gates so that this machine can decide how many bulbs have been switched on?

problem

Adding and multiplying

11 to 14

Amy misread a question and got an incorrect answer. What should the answer have be?

article

Adding with the abacus

5 to 16

Nowadays the calculator is very familiar to many of us. What did people do to save time working out more difficult problems before the calculator existed?

problem

Adding angles

11 to 14

Weekly Problem 47 - 2016
What is the sum of the six marked angles?

problem

Adding plus

7 to 11

Can you put plus signs in so this is true? 1 2 3 4 5 6 7 8 9 = 99 How many ways can you do it?

list

Adding and subtracting

7 to 11

In these activities, you can practise your skills with adding and subtracting. You can also solve problems about what happens when we add or subtract different numbers!

problem

Adding in rows

11 to 14

List any 3 numbers. It is always possible to find a subset of adjacent numbers that add up to a multiple of 3. Can you explain why and prove it?

problem

Added power

14 to 16

How many integers $n$ are there for which $n$ and $n^3+3$ are both prime?

problem

Adding to 400

14 to 16

Find four integers whose sum is 400 and such that the first integer is equal to twice the second integer, three times the third integer and four times the fourth integer.

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Adding in pairs

Adding machine

Adding and multiplying

Adding with the abacus

Adding angles

Adding plus

Adding and subtracting

Adding in rows

Added power

Adding to 400