Question

1. If a, b and c are integers, then according to the associative law of multiplication (a x b) x c must be equal to?

a) a x (b x c) b) (a – b) x c c) (a + b) + c d) (a x b) + (a x c)

2. If a x (b – c) is 8 for a = 2, b = 10 and c = 6 then (a x b) – (a x c) is equal to

a) (-8) b) 12 c) 10 d) 8

3. By observing the number line, state which of the following statement is not true.





a) B is greater than –10 b) A is greater than 0

c) B is greater than A d) B is smaller than 0

4. -11, -8, -5, -2, ……… the next number in the series is _________.

5. 0 x (2 + 8) =

6. Joseph has 10 candies. He gave 4 candies to John and John returned 2 candies to Joseph after a few days. Number of candies Joseph has altogether are?

7. The sum of two integers is -112. If one of them is -109 then the other is?

8. A person gains Rs. 2 on product x and loses Rs 3 on product y. If he sells 8 items of x and 5 items of y his profit or loss is?

9. If the expression [(-43) x 109] can also be written as {a + (-387)}, what is the value of ‘a’?

10. An insect crawls up 5cm every second on a 60cm vertical rod and then falls down 2cm over the next second. How many seconds will it take to climb the rod?​

Answer 1

Answer:

Step-by-step explanation:

If a x (b  – c) is 8 for a = 2, b = 10

a x (b – c) =8

2 × ( 10 -c ) = 8

2× 10 -2 × c = 8

20 - 2c = 8

-2c = 8 -20

c = 12/2

c = 6

then (a x b) – (a x c)

2 × 10 - 2× 6

= 20 - 12

= 8

Ans .8

7. If the sum of two number be -112

One number is equal to -109

So the other number will be

- 109 + x = -112

x = -112 + 109

x = -3

So, the other number will be -3