Skip over navigation
Adding All Nine
Age 11 to 14
Challenge Level 
Remember to check your adding.
See how many $2$-digit numbers you can find that are divisible by $9$.
What happens if you just use the numbers from $1$ to $8$?
See how many $2$-digit numbers you can find that are divisible by $9$.
What happens if you just use the numbers from $1$ to $8$?
You may also like
Summing Consecutive Numbers
15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?