Page 79 - Start Up Mathematics_7

1 1 1
Now × 36 = 18, × 36 = 12, × 36 = 4. Since 18 + 12 + 4 = 34 gold coins, the sons
2 3 9
returned the goldsmith the 2 borrowed coins.
Keeping in mind that the coins borrowed from the goldsmith were not used to fulfill the
father’s wish and distribution of 34 coins was not possible as per his wish, do you think
that the wish was actually fulfilled? Why or why not?

Review Exercises

Multiple ChoiCe Questions
0
1. The expression which best describes the rational number is:
3
(a) 0 (b) 1 (c) 3 (d) undefined
24
2. The rational number –18 , when reduced to standard form is:

12 4 –4 –24
(a) (b) (c) (d)
–9 –3 3 18
3. State which of these is a rational number?
5
(a) π (b) (c) √2 (d) 1.7
0

4. The product of rational number 3 and its multiplicative inverse is:
4
(a) 1 (b) 0 (c) 3 (d) 9
4 16
5 4
5. A rational number lying between and is:
14 7
1 2 3
(a) (b) (c) (d) 1
2 7 4
8
6. The value of the expression –3 ÷ 12 is:
4
36 30 18 –9
(a) (b) (c) (d)
31 32 16 8

7. Without actual computation, we can say that the value of 5 7 ÷ 7 5 is:
9 9
1
(a) greater than 1 (b) greater than 2 (c) less than 1 (d) less than
2
8. A decimal which cannot be expressed as rational number is:
(a) 0.34128590... (b) 0.333333... (c) 2.105 (d) 4.0

solve Mentally
True or False

1. Two equivalent fractions are always equal.
2. Reciprocal of 0 does not exist.
3. The integer zero is not a rational number.

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