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E:\Working\Focus_Learning\Math_Genius_5_(05-10-2023)\Open_Files\CHAP_03
\\February 16, 2024 2:20 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

Practice time 3G

1. Complete the table:
HCF LCM Product of two numbers

(a) 12 324
(b) 4 252
(c) 72 864
(d) 50 300

2. Find the LCM of two numbers, if their product is 225 and the HCF is 9.
3. The HCF of two numbers is 15 and LCM is 45. If one of the numbers is 27, find the
other.

4. The product of two numbers is 450. Find their LCM if their HCF is 15.
5. If the LCM of two numbers is 120 and their product is 1800, what will be the HCF?

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

76 Mathematics-5