Take Three Numbers
Age 7 to 11
Challenge Level
What happens when you add three numbers together? Will your answer be odd or even? How do you know?
Which Scripts?
Age 7 to 11
Challenge Level
There are six numbers written in five different scripts. Can you sort out which is which?
The Deca Tree
Age 7 to 11
Challenge Level
Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.
A Mixed-up Clock
Age 7 to 11
Challenge Level
There is a clock-face where the numbers have become all mixed up. Can you find out where all the numbers have got to from these ten statements?
Round the Four Dice
Age 7 to 11
Challenge Level
This activity involves rounding four-digit numbers to the nearest thousand.
Number Differences
Age 7 to 11
Challenge Level
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
Round the Three Dice
Age 7 to 11
Challenge Level
What happens when you round these three-digit numbers to the nearest 100?
Swimming Pool
Age 5 to 11
Challenge Level
In this problem, we're investigating the number of steps we would climb up or down to get out of or into the swimming pool. How could you number the steps below the water?
Reasoned Roundinglive
Age 7 to 14
Challenge Level
Four strategy dice games to consolidate pupils' understanding of rounding.
First Connect Three
Age 7 to 11
Challenge Level
Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?
Dicey Operations in Line
Age 7 to 11
Challenge Level
Who said that adding, subtracting, multiplying and dividing couldn't be fun?
Tug Harder!
Age 7 to 11
Challenge Level
In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you do so that you get to the end of the number line first?
Count Me In
Age 7 to 11
Challenge Level
How do you know whether you will reach these numbers when you count in steps of six from zero?
Sea Level
Age 7 to 11
Challenge Level
The picture shows a lighthouse and many underwater creatures. If you know the markings on the lighthouse are 1m apart, can you work out the distances between some of the different creatures?
Magic Vs
Age 7 to 11
Challenge Level
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
Four-digit Targets
Age 7 to 11
Challenge Level
You have two sets of the digits 0-9. Can you arrange these in the five boxes to make four-digit numbers as close to the target numbers as possible?
Space Distanceslive
Age 7 to 11
Challenge Level
This task focuses on distances travelled by the asteroid Florence. It's an opportunity to work with very large numbers.
The Remainders Game
Age 7 to 14
Challenge Level
Play this game and see if you can figure out the computer's chosen number.
Roman Numerals
Age 7 to 11
Challenge Level
Can you find some examples when the number of Roman numerals is fewer than the number of Arabic numerals for the same number?
Coded Hundred Square
Age 7 to 11
Challenge Level
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
Representing Numberslive
Age 7 to 11
Challenge Level
Find as many different ways of representing this number of dots as you can.
Nice or Nasty
Age 7 to 14
Challenge Level
There are nasty versions of this dice game but we'll start with the nice ones...
Satisfying Four Statements
Age 7 to 11
Challenge Level
Can you find any two-digit numbers that satisfy all of these statements?
Number Match
Age 5 to 11
Challenge Level
A task which depends on members of the group noticing the needs of others and responding.
Planning a School Trip
Age 7 to 11
Challenge Level
You are organising a school trip and you need to write a letter to parents to let them know about the day. Use the cards to gather all the information you need.
Less Is Morelive
Age 7 to 11
Challenge Level
Use your knowledge of place value to try to win this game. How will you maximise your score?
Three Neighbours
Age 7 to 14
Challenge Level
Take three consecutive numbers and add them together. What do you notice?
What Distance?live
Age 7 to 11
Challenge Level
Can you use subtraction to answer these questions about real-life distances?
Ordering Journeyslive
Age 7 to 11
Challenge Level
How would you put these journey lengths in order? Give a bit of a place value challenge with subtractions set out not as a calculation.
Number Lines in Disguise
Age 7 to 14
Challenge Level
Some of the numbers have fallen off Becky's number line. Can you figure out what they were?
Square Subtraction
Age 7 to 11
Challenge Level
Look at what happens when you take a number, square it and subtract your answer. What kind of number do you get? Can you prove it?
NRICH is part of the family of activities in the Millennium Mathematics Project.