CBSE Class 10 Answered
1. Properties of One:
i. Multiplying any number by 1 does not change the value of the number.
Examples:
8 × 1 = 8
-2 × 1 = -2
0 × 1 = 0
ii. Dividing any number by 1 does not change the value of the number.
Examples:
8 ÷1 = 8
-2 ÷ 1 = -2
0 ÷ 1 = 0
2.
Note: p and q should be co-prime mean HCF(p, q) = 1
If the prime factorisation of q is in the form of 2n 5m , where m and n are non negative integers then p/q have termination decimal expansion.
3.
4.
For finding LCM and HCF of the given number, there is not a specific formula.
i. First find the prime factorisation of all given numbers.
HCF = common factor/s (of all the given numbers) if not then 1 is the HCF.
LCM = common factor/s × uncommon factor/s