Question

find the smallest number which is exactly divisible by all the numbers from 1to 9

Answer 1

OK first start by multiplying these numbers:

1*2*3*4*5*6*7*9

Notice that 4*2=8

so cancel 4 and 2

Also cancel 6 and 3 because

6=3*2 but 9 and 8 is already there

Hope we get our answer

1*5*7*8*9

=2520

That's the number.

Hope it helps.