I. Choose the correct answer. 1. Which of the following is correct? a) 965 ÷ (-965) = 0 b) (-62) x10 =620 c) (-60) ÷ (-10) =6 d) (-1) x (-2) x (-3) =6 2. On a number line when we add a positive integer, we move to a) the right b) the left c) zero d) left and right alternatively 3. The additive inverse of (-4) is a) -4 b) 4 c)-5 d) 0 4. A pair of integers whose sum is other than (-10) is a) (-8, -2) b) (2, -2) c) (-6, -4) d) (-7, -3) 5._________ x (-9) = -72 a) -8 b) -7 c) 8 d) -9 6. The additive identity of (-23) is a) -1 b) 0 c)-23 d)1 7. (-41) ÷ [(-40) + (-1)] is a) 1 b) 2 c)3 d) 4 8. Which of the following is incorrect? a) (-18) x 8 x (-4) > 0 b) [7 x (-6)] + 42 =0 c) (-32) ÷ [(4x2) + 8] < 0 d) [(-16) ÷ 4] ÷ (-2) < 0 II. Fill in the blanks: i) (-42) + ---------- = 0 ii) (-28) ÷ ----------- = (-4) iii) (-6) x ----------- = (-12) iv) ---------- ÷ (-1) = (-284) v) ----------- x 1 = (-496) vi) (-15) + 148 = ------------- + (-15) III. State true or false: i) Any integer divided by 0 gives 0. ii) The product of 12 negative integers is a negative integer. iii) Quotient of 2 negative integers is negative. iv) (-1) multiplied by itself for 1000 times will give 1. IV. Do as directed: 9. Write a pair of positive and negative integers whose sum is (-20) 10. Add 300, -41, -72 11. Use a number line and find out (-9) + 2 12. The temperature of Delhi which was 420 c fell by 20 c each day for a week. What is the temperature after the whole week? 13. Show with an example that the product of three negative integers is a negative integer. 14. Use appropriate property to solve 4 + (-8) + 6 + (-2) 15. Hazel started a game of monopoly with Rs.70. She had to pay Rs.25 as tax and she received Rs.10 as rent of one of her sites. Again, she won Rs.20 by way of lottery and was then fined Rs.50 for over speeding. How much money was left with her at the end of the game? 16. Start with the integer -8. Add -12 to it, subtract 10 from the result. Divide the result by 3 and multiply the answer by -2. What do you get? 17. The product of three integers is -600. If two of them are -15 and 10, find the third integer. 18. A boy threw a marble 28m vertically up in the air which later fell and settled on the bottom of the pond 12m deep. By how much distance did the marble fall? Air 28m Ground --------------------------------------- -Water---------------------12m--- ----------------------------------------- 19. Vaibhav is an enthusiastic sports boy. While practising long jump, he managed 90 cm on first day. Second day onwards he managed to jump 2 cm longer than the previous day and so on. On the sixth day, how long did he jump? 20. Find the value of: (-10- 10) ÷ {-10- (-10- 10)}