Addition and subtraction

problem
Throw a 100

Age

7 to 11

Challenge level

Can you score 100 by throwing rings on this board? Is there more than way to do it?
problem
Rocco's race

Age

7 to 11

Challenge level

Rocco ran in a 200 m race for his class. Use the information to find out how many runners there were in the race and what Rocco's finishing position was.
problem
Super shapes

Age

7 to 11

Challenge level

The value of the circle changes in each of the following problems. Can you discover its value in each problem?
problem
Twenty divided into six

Age

7 to 11

Challenge level

Katie had a pack of 20 cards numbered from 1 to 20. She arranged the cards into 6 unequal piles where each pile added to the same total. What was the total and how could this be done?
problem
Amy's dominoes

Age

7 to 11

Challenge level

Amy has a box containing domino pieces but she does not think it is a complete set. Which of her domino pieces are missing?
problem
Calendar calculations

Age

7 to 11

Challenge level

Try adding together the dates of all the days in one week. Now multiply the first date by 7 and add 21. Can you explain what happens?
problem
Mrs Beeswax

Age

5 to 7

Challenge level

In how many ways could Mrs Beeswax put ten coins into her three puddings so that each pudding ended up with at least two coins?
problem
Eleven

Age

11 to 14

Challenge level

Replace each letter with a digit to make this addition correct.
problem
Next number

Age

7 to 11

Challenge level

Find the next number in this pattern: 3, 7, 19, 55 ...
problem
Add 3 dice

Age

7 to 11

Challenge level

Three dice are placed in a row. Find a way to turn each one so that the three numbers on top of the dice total the same as the three numbers on the front of the dice. Can you find all the ways to do this?