Worksheets Chapter 1 Real Number Class 10 Mathematics Find one rational and one irrational no between √3 and √5. Ans. Rational number between √3 and √5 is √4, and irrational number between √3 and √5 is (√3+√5)/2. Question. If HCF of 144 and 180 is expressed in the form 13m - 3, find the value of m. Ans. By Euclid's division lemma. 180 = 144 × 1 + 36. 144 = 36 × 4 + 0.