Challenge Level

1st | |||||

3rd | 4th | 5th | 2nd | ||

**Work out the number in the pale blue cell first:**

*If the bottom row is 6N, what can you deduce about the first digit of N?*

**Work out the numbers in the column marked "2nd":**

*If the fifth row is 5N, what can you deduce about the last digit in that row?
What can you say about the last digit of 2N, 4N and 6N?
What can you deduce about the last digit of the first row?
Will it be even or odd?*

*The first digit of N will appear as the last digit in one of the other rows.*

Multiply different possible values for the last digit of N and see which gives you the results you are looking for.

**Once you have completed the right hand column you'll know which numbers will fill the column marked "3rd".**

**After completing the column marked "3rd" try to complete the column marked "4th"...**