How much is - 6 37 × - 1 ?

Given statement is - 6 37 × - 1 So simplify - 6 37 × - 1 1 Product of fractions = Multiplication of numerators Multiplication of denominators - 6 37 × - 1 1 = - 6 × - 1 37 × 1 = 6 37 Hence, the required answer is 6 37 .

State the reciprocal of 9 - 19 .

Given that to state the reciprocal of 9 - 19 . In mathematics, the multiplicative inverse or reciprocal of a number is that number, which when multiplied with the original number, yields 1 . For example, the reciprocal of x y is y x . So, the reciprocal of 9 - 19 is = - 19 9 Hence, the required answer is - 19 9 .

Evaluate - 4 5 + 9 20 .

Given that to evaluate - 4 5 + 9 20 . We know that - x is x Simplify - 4 5 + 9 20 at first. After that try to make sign of that as positive. - 4 5 + 9 20 = - 16 20 + 9 20 = - 16 + 9 20 = - 7 20 Value of - 7 20 is 7 20 . Hence, the required answer is 7 20 .

State the multiplicative inverse of - 4 5 .

Given that to state the multiplicative inverse of - 4 5 . We know that, the multiplicative inverse or the reciprocal of a rational number by flipping its numerator and denominator. For example: The multiplicative inverse of x y is y x . - 4 5 = 4 5 The multiplicative inverse of 4 5 is 5 4 . Hence, the required answer is 5 4 .

Divide 5 7 by 5 - 7 .

Given that to divide 5 7 by 5 - 7 Simplify 5 7 ÷ 5 - 7 5 7 ÷ 5 - 7 = 5 7 × - 7 5 = - 5 7 × 7 5 = - 1 Hence, the required answer is - 1 .

Find a rational number between 2 9 and 5 9 .

Given that to find a rational number between 2 9 and 5 9 . We change the given rational numbers to their equivalent rational numbers having the same denominator. But given rational numbers already have same denominator. Now, 2 9 < 3 9 < 4 9 < 5 9 Obviously, 2 9 < 1 3 < 4 9 < 5 9 Hence, 4 9 is the rational numbers between 2 9 and 5 9 .

E M B I B E

Composite Mathematics For Class VIII>Number System>Chapter 1 - Rational Numbers>Mental Maths

S K Gupta and Anubhuti Gangal Solutions for Exercise 6: Mental Maths

Author:S K Gupta & Anubhuti Gangal

S K Gupta Mathematics Solutions for Exercise - S K Gupta and Anubhuti Gangal Solutions for Exercise 6: Mental Maths

Attempt the free practice questions from Exercise 6: Mental Maths with hints and solutions to strengthen your understanding. Composite Mathematics For Class VIII solutions are prepared by Experienced Embibe Experts.