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d. Find the greatest number of 3-digits which is exactly divisible by 40, 48
and 60. (Hint : Find the H.C.F.)
e. The length, breadth and height of a room are 6m 80 cm, 5m 10 cm and 5

m 40 cm respectively. Find the longest tape which can measure the
dimensions of the room exactly. (Hint : Find the H.C.F.)

R apid F ir e
Rapid Fire

a. _____________ is the least factor of any number.
b. Prime numbers have _____________ factors.

c. The HCF of 15 and 75 is _____________ .

d. _____________ is first composite numbers.
e. HCF of co-prime numbers is _____________ .

Ment al Mat hs
Mental Maths

Find a two digit number with given specification :
a. When divided by 2, leaves remainder 1.

b. When divided by 3, leaves remainder 2.
c. When divided by 4, leaves remainder 3.

d. When divided by 5, leaves remainder 4.
e. When divided by 6, leaves remainder 5.

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Mathematics In Focus - 5