You must choose four different digits from $1 - 9$ and put one in each box. For example:
This gives four two-digit numbers:
| $52$ | (reading along the $1$st row) |
| $19$ | (reading along the $2$nd row) |
| $51$ | (reading down the left hand column) |
| $29$ | (reading down the right hand column) |
In this case their sum is $151$.
Your challenge is to find four different digits that give four two-digit numbers which add to a total of $100$.
How many ways can you find of doing it?
This problem is adapted from Make 200 from 'Mathematical Challenges for Able Pupils Key Stages 1 and 2', published by DfES. You can find out more about this book, including how to order it, on the Standards website here .