Addition and subtraction

problem
Sometimes we lose things

Age

7 to 11

Challenge level

Well now, what would happen if we lost all the nines in our number system? Have a go at writing the numbers out in this way and have a look at the multiplications table.
problem
On target

Age

7 to 11

Challenge level

You have 5 darts and your target score is 44. How many different ways could you score 44?
problem
Let's face it

Age

7 to 11

Challenge level

In this problem you have to place four by four magic squares on the faces of a cube so that along each edge of the cube the numbers match.
problem
The 24 game

Age

7 to 11

Challenge level

There are over sixty different ways of making 24 by adding, subtracting, multiplying and dividing all four numbers 4, 6, 6 and 8 (using each number only once). How many can you find?
problem
Sam's quick sum

Age

7 to 11

Challenge level

What is the sum of all the three digit whole numbers?
problem
Oddly

Age

7 to 11

Challenge level

Find the sum of all three-digit numbers each of whose digits is odd.
problem
Difference

Age

7 to 11

Challenge level

Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
problem
Pouring the punch drink

Age

7 to 11

Challenge level

There are 4 jugs which hold 9 litres, 7 litres, 4 litres and 2 litres. Find a way to pour 9 litres of drink from one jug to another until you are left with exactly 3 litres in three of the jugs.
problem
Four goodness' sake

Age

7 to 11

Challenge level

Use 4 four times in a calculation. What answers can you get?
problem
Scoring with dice

Age

7 to 11

Challenge level

I throw three dice and get 5, 3 and 2. Add the scores on the three dice. What do you get? Now multiply the scores. What do you notice?