What is the smallest number which can be divided exactly by 22,44,55

The smallest number that can be divided exactly by 22, 44, and 55 is the least common multiple of these numbers.

The prime factorization of the numbers are:
22 = 2 * 11
44 = 2^2 * 11
55 = 5 * 11

The least common multiple (LCM) of the numbers is the product of the highest power of each prime factor that appears in any of the numbers. So,

LCM(22, 44, 55) = 2^2 * 5 * 11 = 220

Therefore, the smallest number that can be divided exactly by 22, 44, and 55 is 220.