Do you know, how many years do the following animals live on an average ? If not, solve the expressions given besides the animal to get the average life expectancy of the corresponding animal. Animal Expression Life Expectancy (in years) Goat, chicken 4 12 13 × 1 5 8 Mouse 5 9 ÷ 1 8 × 27 40 Domestic dog 14 2 3 ÷ 1 1 6 + 3 7 Giraffe, pig 1 3 6 - 3 4 ÷ 1 8 × 5 Horse 3 5 6 ÷ 1 1 9 × 4 2 3 + 3 9 10

The life expectancy can be found by multiplying the algebraic expressions. 1 ) G o a t , c h i c k e n : 4 12 13 × 1 5 8 ⇒ 64 13 × 13 8 = 8 y e a r s 2 ) m o u s e : 5 9 ÷ 1 8 × 27 40 ⇒ 5 9 × 8 1 × 27 40 = 3 y e a r s . 3 ) d o m e s t i c d o g 14 2 3 ÷ 1 1 6 + 3 7 ⇒ 44 3 ÷ 7 6 + 3 7 ⇒ 44 3 × 6 7 + 3 7 ⇒ 88 7 + 3 7 ⇒ 91 7 = 13 y e a r s . 4 ) g i r a f f e 8 - 3 8 ÷ 1 8 × 5 5 8 ÷ 1 8 × 5 = 5 8 × 8 × 5 = 25 y e a r s 5 ) h o r s e 3 5 6 ÷ 1 1 9 × 4 2 3 + 3 9 10 23 6 ÷ 10 9 × 14 3 + 39 10 = 23 6 × 9 10 × 14 3 + 39 10 = 161 10 + 39 10 = 200 10 = 20 y e a r s . Animal Expression Life Expectancy (in years) Goat, chicken 4 12 13 × 1 5 8 8 Mouse 5 9 ÷ 1 8 × 27 40 3 Domestic dog 14 2 3 ÷ 1 1 6 + 3 7 13 Giraffe, pig 1 3 6 - 3 4 ÷ 1 8 × 5 25 Horse 3 5 6 ÷ 1 1 9 × 4 2 3 + 3 9 10 20

Anuj had 3 5 of a pizza. He ate 2 3 of it. What fraction of his pizza did he eat?

Anuj had 3 5 of a pizza Part of pizza he ate is 2 3 So, fraction of pizza he eat is 2 3 of 3 5 ⇒ 2 3 × 3 5 = 2 5 Hence, he eat 2 5 t h of pizza

What is the smallest fraction that must be added to 1 1 3 ÷ 1 1 2 ÷ 1 1 9 to make the result an integer?

We have to add a smallest fraction 1 1 3 ÷ 1 1 2 ÷ 1 1 9 to make result integer. Convert each fraction into improper fraction 1 1 3 ÷ 1 1 2 ÷ 1 1 9 ⇒ 1 × 3 + 1 3 ÷ 1 × 2 + 1 2 ÷ 1 × 9 + 1 9 ⇒ 4 3 ÷ 3 2 ÷ 10 9 As we know that a b ÷ b c = a b × c b 4 3 × 2 3 × 9 10 = 4 5 As 0 < 4 5 < 1 , we need to subtract from the nearest integer value i.e 1 . So, the required value is 1 - 4 5 = 5 - 4 5 = 1 5 Here, 1 5 is the least fraction that must be added

What is the exact value of 2 . 7 × 0 . 8 × 3 . 3 1 . 1 × 0 . 9 × 6 . 4

Given, 2 . 7 × 0 . 8 × 3 . 3 1 . 1 × 0 . 9 × 6 . 4 Simplify the given fractions 2 . 7 × 0 . 8 × 3 . 3 1 . 1 × 0 . 9 × 6 . 4 = 2 . 16 × 3 . 3 0 . 99 × 6 . 4 = 1 . 125 The exact value is 1 . 125

E M B I B E

New Mathematics Today Class 7>Chapter 2 - Fractions and Decimals>Revision Exercise>Q 12

EASY

7th ICSE

IMPORTANT

Earn 100

A circular block of cheese is divided into equal slices as shown alongside in the figure. If each slice of cheese weight $31.25 g$ , what is the weight of the whole block ? Express the weight as a fraction in $k g .$

Important Questions on Fractions and Decimals

EASY

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 2 - Fractions and Decimals>Worksheet>Q 1

Do you know, how many years do the following animals live on an average ? If not, solve the expressions given besides the animal to get the average life expectancy of the corresponding animal.

Animal	Expression	Life Expectancy (in years)
Goat, chicken	$4 \frac{12}{13} \times 1 \frac{5}{8}$
Mouse	$\frac{5}{9} \div \frac{1}{8} \times \frac{27}{40}$
Domestic dog	$14 \frac{2}{3} \div 1 \frac{1}{6} + \frac{3}{7}$
Giraffe, pig	$\frac{1}{3} [\frac{(6 - 3)}{4} \div \frac{1}{8} \times 5]$
Horse	$3 \frac{5}{6} \div 1 \frac{1}{9} \times 4 \frac{2}{3} + 3 \frac{9}{10}$