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Mental Maths

1. LCM of two co-prime numbers is their:

(a) product (b) HCF

(c) common factor (d) sum
2. HCF of two co-prime numbers is

(a) 0 (b) 1

(c) sum of the numbers (d) product of the numbers
3. If a number is divisible by 2 and 3, then it will also be divisible by

(a) 6 (b) 8

(c) 9 (d) 4
4. Which of the following number will complete the given factor tree?

16 × 4

2 × 8 2 × 2

2 × 4

2 × 2

(a) 32 (b) 64
(c) 72 (d) 48

5. How many prime numbers between 1 and 50 have their ones digit as 3?

(a) 3 (b) 4
(c) 5 (d) 2

Mathematics-5 77