Question

find the least number exactly divisible by first prime number upto 10 ​

Answer 1

Answer:

210

Step-by-step explanation:

the prime numbers up to 10 are 2,3,5 and 7

Divisibility rules

for 2 : unit digit must be even

for 3 : sum of the digits of a given number must be divided by 3

for 5 : unit digit should contain 0 or 5

for 2 and 5 common rule is unit digit should be 0 such that if we add remaining numbers it should be multiples of 3.

those are 30, 60, 90, 120, 150, 180, 210, 240 and so on

among them 210 is the least number which is exactly divided by those 4 primes