The least number divisible by all the number from 1 to 10 will be the L.C.M of following number,
1=1
2=2×1
3=3×1
4=2×2
5=5×1
6=2×3
7=7×1
8=2×2×2
9=3×3
10=2×5
So, the L.C.M. of these number is 1×2×2×2×3×3×5×7=2520
Hence, the least number divisible by all the numbers from 1 to 10 is 2520
