New Math Class 6 Exercise 1.4 Thinking Time Page 14

New Math Class 6 Exercise 1.4 Thinking Time Page 14

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Find the smallest 4− digit number which is divisible by 21,56 and 63


Smallest number divisible by 21,56,63

Factors of 21=3×7


Factors of 56=2×2×2×7


Factors of 63=3×3×7




∴504 is the smallest number divisible by 21,56 and 63


Now, smallest 4-digit number=1000






But we need to find a number where the remainder is 0


Required number=1000+(504+8)=1000+512=1512


So,1512 is the smallest 4 digit number.

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