RATIONAL NUMBERS ‐ CLASS VIII Time: 45 Mins MM: 20 Question 1 (1 mark)
25×−37−114−37×35 Question 2 (1 mark)
Write the rational number that does not have a reciprocal. Question 3 (1 mark)
Write the additive inverse of 98. Question 4 (1 mark) Find the multiplicative inverse of−913. Question 5 (1 mark) The product of any two irrational numbers is__________. Question 6 (1 mark) If 1/x=x2/27, then x is ________ number. Question 7 (2 marks) Write the rational numbers that are equal to their reciprocals.
Question 8 (2 marks)
How many numbers in the following list are irrational? √3,π,e,1/3,
√49,22/7,0.
Question 9 (2 marks)
If a =2 and b = 3, then value of (1/a+1/b)a. Question 10 (2 marks) If r is a rational number and s is an irrational number, then r+s and r‐s are ______. Question 11 (2 marks) Find: (64/25)−32. Question 12 (2 marks) What can the maximum number of digits be in the repeating block of digits in the decimal expression of 117? Question 13 (2 marks) a) By what rational number should 21/43 be multiplied to obtain
12/23.
b) Find the multiplicative inverse of ‐13.