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...
Dicey Operations
Age 11 to 14
Challenge Level
Who said that adding, subtracting, multiplying and dividing couldn't be fun?
Legs Eleven
Age 11 to 14
Challenge Level
Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?
How Many Miles to Go?
Age 11 to 14
Challenge Level
How many more miles must the car travel before the numbers on the milometer and the trip meter contain the same digits in the same order?
Farey Sequences
Age 11 to 14
Challenge Level
There are lots of ideas to explore in these sequences of ordered fractions.
Difference Sudoku
Age 14 to 16
Challenge Level
Use the differences to find the solution to this Sudoku.
Place Your Orders
Age 11 to 14
Challenge Level
Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?
Add to 200
Age 11 to 14
Challenge Level
By selecting digits for an addition grid, what targets can you make?
Forwards Add Backwards
Age 11 to 14
Challenge Level
What happens when you add a three digit number to its reverse?
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?
Place Value, Integers, Ordering and Rounding - Short Problems
Age 11 to 16
A collection of short problems on place value, integers, ordering and rounding.
Subtraction Surprise
Age 7 to 14
Challenge Level
Try out some calculations. Are you surprised by the results?
More Less Is More
Age 7 to 14
Challenge Level
In each of these games, you will need a little bit of luck, and your knowledge of place value to develop a winning strategy.
NRICH is part of the family of activities in the Millennium Mathematics Project.