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Question 21 Mark
Find: $37.8 \div 1.4$
Answer
Here,
$37.8 \div 1.4$
$=\frac{378}{10} \div \frac{14}{10}$
$=\frac{378}{10} \times \frac{10}{14}$
$= \frac{378}{14}$
$= 27$
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Question 51 Mark
Find: $0.5 \div 0.25$
Answer
Here,
$0.5 \div 0.25$
$=\frac{5}{10} \div \frac{25}{100}$
$=\frac{5}{10} \times \frac{100}{25}$
$=\frac{10}{5}$
$= 2$
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Question 61 Mark
Find: $30.94 \div 0.7$
Answer
Here,
$30.94 \div 0.7$
$=\frac{3094}{100} \div \frac{7}{10}$
$=\frac{3094}{100} \times \frac{10}{7}$
$=\frac{442}{10}$
$= 44.2$
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Question 71 Mark
Find: $3.25 \div 0.5$
Answer
Here,
$3.25 \div 0.5$
$=\frac{325}{100} \div \frac{5}{10}$
$=\frac{325}{100} \times \frac{10}{5}$
$=\frac{65}{10}$
$= 6.5$
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Question 81 Mark
Find: $36 \div 0.2$
Answer
Here,
$36 \div 0.2$
$=36 \div \frac{2}{10}$
$=36 \times \frac{10}{2}$
$=18 \times 10$
$= 180$
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Question 91 Mark
Find: $7 \div 3.5$
Answer
Here,
$7 \div 3.5$
$= 7 \div \frac{35}{10}$
$=7 \times \frac{10}{35}$
$=\frac{70}{35}$
$= 2$
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Question 101 Mark
Find: $2.7 \div 100$
Answer
We have,
$2.7 \div 100$
$= \frac{27}{10} \times \frac{1}{100} $
$= \frac{27}{1000} $
$= 0.027$
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Question 111 Mark
Find : $0.7 \div 10$
Answer
Here,
$0.7 \div 10$
$= \frac{0.7}{10} = \frac{7}{10 \times 10} = \frac{7}{100} = 0.07$
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Question 121 Mark
Find: $52.5 \div 10$
Answer
Here,
$52.5 \div 10$
$=\frac{52.5}{10} = \frac{525}{10 \times 10} = \frac{525}{100} = 5.25$
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Question 131 Mark
Find: $4.8 \div 10$
Answer
We have,
$4.8 \div 10$
$= \frac{48}{10} \div 10$
$= \frac{48}{10} \times \frac{1}{10} $
$= \frac{48}{100} $
$= 0.48$
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Question 141 Mark
Find: $0.80 \div 5$
Answer
Here,
$0.80 \div 5$
$=\frac{80}{100} \div 5$
$=\frac{80}{100} \times \frac{1}{5}$
$=\frac{16}{100}$
$= 0.16$
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Question 151 Mark
Find: $3.96 \div 4$
Answer
Here,
$3.96 \div 4$
$=\frac{396}{100} \div 4$
$=\frac{396}{100} \times \frac{1}{4}$
$=\frac{99}{100}$
$= 0.99$
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Question 161 Mark
Find: $14.49 \div 7$
Answer
Here,
$14.49 \div 7$
$=\frac{1449}{100} \div 7$
$=\frac{1449}{100} \times \frac{1}{7}$
$=\frac{207}{100}$
$= 2.07$
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Question 171 Mark
Find: $651.2 \div 4$
Answer
Here,
$651.2 \div 4$
$=\frac{6512}{10} \div 4$
$=\frac{6512}{10} \times \frac{1}{4}\\$
$=\frac{1628}{10}$
$= 162.8$
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Question 181 Mark
Find: $65.4 \div 6$
Answer
Here,
$65.4 \div 6$
$ =\frac{654}{10} \div 6 $
$ =\frac{654}{10} \times \frac{1}{6} $
$ =\frac{109}{10} $
$= 10.9$
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Question 191 Mark
Find: $2.48 \div 4$
Answer
Here,
$2.48 \div 4$
$=\frac{248}{100} \div 4$
$=\frac{248}{100} \times \frac{1}{4}$
$=\frac{62}{100}$
$= 0.62$
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Question 201 Mark
Find : $0.35 \div 5$
Answer
$0.35 \div 5 = \frac {35}{100}$
$\div$ 5 = $\frac{35}{100} \times \frac{1}{5}$
$=\frac{1}{100} \times \frac{35}{5}=\frac{1}{100} \times 7 = 0.07$
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Question 211 Mark
Find : $0.4 \div 2$
Answer
$0.4 \div 2 = \frac{4}{10} \div 2=\frac{4}{10} \times \frac{1}{2}=\frac{1}{10} \times \frac{4}{2}$
$=\frac{1}{10} \times 2 = 0.2$
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Question 221 Mark
Find: $101.01 \times 0.01$
Answer
Here,
$101.01 \times 0.01$
$ =\frac{10101}{100} \times \frac{1}{100} $
$ =\frac{10101}{10000} $
$= 1.0101$
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Question 231 Mark
Find: $10.05 \times 1.05$
Answer
Here,
$10.05 \times 1.05$
$=\frac{1005}{100} \times \frac{105}{100}$
$=\frac{105525}{10000}$
$=10.5525$
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Question 241 Mark
Find: $1.07 \times 0.02$
Answer
Here,
$1.07 \times 0.02$
$=\frac{107}{100} \times \frac{2}{100}$ [Changing into fractions]
$=\frac{214}{10000}$
$= 0.0214$
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Question 291 Mark
Find: $0.1 \times 51.7$
Answer
Here,,
$0.1 \times 51.7$
$=\frac{1}{10} \times \frac{517}{10}$ [Changing into fractions]
$=\frac{517}{100}$
$= 5.17$
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Question 301 Mark
Find: $100.01 \times 1.1$
Answer
Here,
$100.01 \times 1.1$
$=\frac{10001}{100} \times \frac{11}{10}$
$=\frac{110011}{1000}$
$= 110.011$
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Question 321 Mark
A two-wheeler covers a distance of $55.3 \ km$ in one litre of petrol. How much distance will it cover in $10$ litres of petrol?
Answer
Distance covered in one litre of petrol $= 55.3 km$
$\therefore$ Distance covered in $10$ litres of petrol $= 55.3 \times 10 = 553 km$
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Question 361 Mark
Find : $156.1 \times 100$
Answer
$156.1 \times 100 = \frac {1561}{10} \times 100$
$= 1561 \times 10 = 15610$
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Question 451 Mark
Find $: 2 \times 0.86$
Answer
$2 \times 0.86$
$ \because 2 \times 86 = 172$ and there are $2$ digits right to the decimal point in $0.86$
Thus $2 \times 0.86 = 1.72$
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Question 461 Mark
Find : $211.02 \times 4$
Answer
$211.02 \times 4$
$ \because 21102 \times 4 = 84408$ and there are $2$ digits right to the decimal point in $211.02$
Thus $211.02 \times 4 = 844.08$
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Question 481 Mark
Find: $20.1 \times 4$
Answer
$20.1 \times 4$
$ \because 201 \times 4 = 804$ and there is one digit right to the decimal point in $20.1$
$ \because 20.1 \times 4 = 80.4$
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Question 491 Mark
Find: $2.71 \times 5$
Answer
$2.71 \times 5$
$\because 271 \times 5 = 135$5 and there are two digits right to the decimal point in $2.71$
Thus $2.71 \times 5 = 13.55$
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Question 501 Mark
Find: $8 \times 4.6$
Answer
$8 \times 4.6$
$ \because 8 \times 46 = 368$ and we have $1$ digit right to the decimal point in $4.6$
Thus $8 \times 4.6 = 36.8$
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