# Selina Concise Class 7 Math Chapter 2 Rational Numbers Exercise 2A Solution

## EXERCISE 2A

(1) Largest two digit number is 99.

Smallest four digit number = 1000

Now let the numerator = 99 and denominator = 1000

∴ Rational number = 99/1000

(2) Write the numerator of each of the following rational numbers:

(i) – 125

(ii) 37

(iii) – 85

(iv) 2

(v) 0

(3) Write the denominator of each of the following rational numbers:

(i) – 15

(ii) 29

(iii) 4

(iv) 1

(v) 1

(4) Numerator = (- 5) × (- 4) = 20

Denominator = (28 – 27) × (8 – 5) = 1 × 3 = 3

∴ Rational number = 20/3

(5) (i) – 15

(ii) – 23

(iii) 18 = 18/a

⇒ a = 18/18 = 1

(iv) – 57 = 57/a

⇒ a = – (57/57) = – 1  (8) Which of the following are not rational numbers:

(v) (0/0) is not a rational number as numerator and denominator both are zero.

(9) Express each of the following integers as a rational number with denominator with denominator 7:   (12) Find x, such that:  (13) Express each of the following rational numbers to the lowest terms: (14) Express each of the following rational numbers in the standard form. Updated: March 7, 2019 — 11:37 am

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