ML Aggarwal Class 6 Solutions for ICSE Maths Chapter 4 Playing with Numbers Ex 4.3
Question 1.
Here are two different factor trees of the number 90. Write the missing numbers:
Solution:
Question 2.
Find the prime factorisation of the following numbers:
(i) 72
(ii) 172
(in) 450
(iv) 980
(v) 8712
(vi) 13500
Solution:
Question 3.
Write the smallest and the greatest 3-digit numbers and express them as the product of prime.
Solution:
Question 4.
Write the smallest five digit number and express it in the form of its prime factors.
Solution:
The smallest 5-digit number is 10000
∴ 10000 = 2 × 2 × 2 × 2 × 5 × 5 × 5 × 5
Question 5.
1 am the smallest number, having four different prime factors. Can you find me?
Solution:
The smallest four different prime numbers are 2, 3, 5 and 7.
∴ The smallest number, having four different prime factor is 2 × 3 × 5 × 7 = 210.