Page 33 - Start Up Mathematics_8 (Non CCE)

Review Exercises

Multiple ChoiCe Questions

1. 3 times (–6) times (–15) divided by 5 is:
(a) –54 (b) 48 (c) 54 (d) –48

2
2. The multiplicative inverse of 2 is:
5
−12 5 12 −5
(a) (b) (c) (d)
5 12 5 12

3. Which order shows the following rational numbers in ascending order:
26 35 46 17
A = ,B = ,C = ,D =
3 4 5 2
(a) A, B, C, D (b) B, D, A, C (c) D, A, B, C (d) D, C, B, A
4. The number x and –x are additive inverses. Which number is midway between them on a number line?
1
(a) 1 (b) 0 (c) –1 (d)
2
4
5. Which number has the same absolute value as ?
3
8 −8 −4 3
(a) (b) (c) (d)
9 9 3 4
2 2
6. The sum of −16 3 + 16 is:
3
1 1 1
(a) 32 (b) 33 (c) −33 (d) 0
3 3 3

solve Mentally

True or False
1. Irrational numbers are non-terminating numbers.
2. There exist 10 rational numbers between 1 and 10.

 a c  e a  c e 
3.  b + d   + f = b +  d − f  is the associative property of addition of rational numbers.



−5 7
4. is the additive inverse of .
7 5
5. 1 is the multiplicative identity for multiplication of rational numbers.

Fill in the Blanks

1. The rational number equal to its negative is its _____________.
2. The product of two rational numbers is always a __________.
3. The product of a negative and positive rational number is always a __________ number.
4. Division of rational numbers is ___________ associative.
1
5. The rational number 3 lies between _________ and _________ on the number line.
2

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