39163

enter your solution here: all the numbers of the matchsticks are in the 3 time tables but each time you miss out a extra number that is in the 3 times table so for example:

3 matchsticks- this is correct
6 matchsticks- this is not correct so we have missed out 1 so far
9 matchsticks- this is correct
12 matchsticks- this is not correct so this time we have missed 1 out again
15 matchsticks- this is not correct so this time we have missed out 2
18 matchsticks- this is correct
21 matchsticks- this is not correct we have missed out 1 this time so far
24 matchsticks- this is not correct so now we have missed out 2
27 matchsticks- this is not correct so now we have missed out 3
30 matchsticks- this is correct
(etc)