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Maths 1 Mark Question

Decimals · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 65 questions.

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65 questions · self-marked practice — reveal the answer and mark yourself.

Question 31 Mark
Add the following:18.03, 146.3, 0.829 and 5.324
Answer
18.03 + 146.3 + 0.829 + 5.324= 164.33 + 6.153
= 170.483
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Question 51 Mark
Express the following fractions as decimals:
$25\frac{1}{8}$
Answer
$25\frac{1}{8}$
$=25+\frac{1}{8}$
$=25+\frac{1\times125}{8\times125}$
$=25+\frac{125}{10000}$
$=25+0.125$
$=25.125$
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Question 81 Mark
Express the following fractions as decimals:
$39\frac{7}{35}$
Answer
$39\frac{7}{35}$
$=\frac{1372}{35}$
$=39.2$
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Question 181 Mark
Divide:
142.45 by 10
Answer
$\frac{142.45}{10}$
$=\frac{14245}{100\times10}$
$=\frac{14245}{1000}$
$=14.245$
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Question 191 Mark
Find:
13.01 × 5.01
Answer
$13.01 × 5.01$
$\frac{1301}{100}\times\frac{501}{100}$
$=\frac{651801}{10000}$
$=65.1801$
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Question 201 Mark
Find the product:
20.708 × 1000
Answer
On dividing by 1000, we get,
$\frac{20708}{1000}\times1000$
$=20708$
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Question 211 Mark
A vehicle covers a distance of 43.2km in 2.4 litres of petrol. How much distance will it travel in 1 litre of petrol?
Answer
Distance covered in 2.4 litres of petrol = 43.2km
Distance covered in 1 litre of petrol $=\frac{43.2}{2.4}$
$=18\text{km}$
The distance travelled in 1 litre of petrol is 18km
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Question 221 Mark
Find the product:
100 × 0.005
Answer
On dividing by 1,000, we get,
$100\times\frac{5}{1000}$
$=\frac{5}{10}$
$=0.5$
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Question 251 Mark
Divide:
0.765 by 0.9
Answer
$\frac{0.765}{0.9}=\frac{765\times10}{9\times100}$
$=\frac{7650}{9000}$
$=0.85$
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Question 281 Mark
Divide:
164.6 by 200
Answer
$\frac{164.6}{200}$
$=\frac{1646}{200\times10}$
$=\frac{1646}{2000}$
$=0.823$
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Question 291 Mark
Find the product:
12.075 × 100
Answer
On dividing by 1,000, we get,
$\frac{12075}{1000}\times100$
$=\frac{12075}{10}$
$=1207.5$
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Question 331 Mark
Take out 3.547 from 7.2
Answer
According to the question, we need to subtract 3.547 from 7.2
On converting the given decimals to like decimals, we get the new decimals as 3.547 and 7.200
Let us now subtract them.
7.200 - 3.547
= 3.653
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Question 341 Mark
One metre of cloth ₹ 152.50. What is the cost of 10.75 metres of cloth?
Answer
We have,
One metre of cloth cost = ₹ 152.50
Cost of 10.75 metres = 10.75 × 152.50
= ₹ 1639.375
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Question 351 Mark
Find the product:
4.74 × 10
Answer
On dividing by 100, we get,
$4.74\times10$
$=\frac{474}{100}\times10$
$=\frac{474}{10}$
$=47.4$
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Question 371 Mark
Find:
1.07 × 0.02
Answer
$1.07 × 0.02$
$\frac{107}{100}\times\frac{2}{100}$
$=\frac{107\times2}{10000}$
$=0.0214$
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Question 381 Mark
Find the product:
3.4 × 17
Answer
On dividing the decimal by 10 and multiplying the numbers, we get,
$\frac{34}{10}\times17$
$=\frac{578}{10}$
$=57.8$
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Question 391 Mark
Find the product:
35.853 × 100
Answer
On dividing by 1,000, we get,
$\frac{35853}{1000}\times100$
$=\frac{35853}{10}$
$=3585.3$
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Question 421 Mark
Find the product:
0.0215 × 10
Answer
Because the decimal is after 4 places from the right, we will divide by 10,000. We get,
$\frac{215}{10000}\times10$
$=\frac{215}{1000}$
$=0.215$
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Question 441 Mark
Find the product:
28.73 × 47
Answer
On dividing the decimal by 100 and multiplying the numbers, we get,
$\frac{2873}{100}\times47$
$=\frac{135031}{100}$
$=1350.31$
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Question 451 Mark
Find the product:
42.5 × 100
Answer
On dividing by 10, we get,
$\frac{425}{10}\times100$
$=425\times10$
$=4250$
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Question 461 Mark
Find the product:
0.0529 × 1000
Answer
On dividing by 10,000, we get,
$\frac{529}{10000}\times1000$
$=\frac{529}{10}$
$=52.9$
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Question 471 Mark
Find the product:
0.0054 × 10
Answer
Because the decimal is after 4 places from the right, we will divide by 10,000. We get,
$\frac{54}{10000}\times10$
$=\frac{54}{1000}$
$=0.054$
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Question 481 Mark
Divide:
16.344 by 12
Answer
$\frac{16.344}{12}$
$=\frac{16344}{12\times1000}$
$=\frac{1362}{1000}$
$=1.362$
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Question 501 Mark
Find the product:
0.0415 × 59
Answer
On dividing the decimal by 10000 and multiplying the numbers, we get,
$\frac{415}{10000}\times59$
$=\frac{24485}{10000}$
$=2.4485$
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Question 511 Mark
Find:
211.9 × 1.13
Answer
$211.9 × 1.13$
$\frac{2119}{10}\times\frac{113}{100}$
$=\frac{239447}{1000}$
$=239.447$
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Question 521 Mark
Divide:
0.768 by 1.6
Answer
$\frac{0.768}{1.6}$
$=\frac{768\times10}{16\times1000}$
$=\frac{7680}{16000}$
$=0.48$
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Question 561 Mark
Find the product:
0.45 × 10
Answer
On dividing by 100, we get,
$\frac{45}{100}\times10$
$=\frac{45}{10}$
$=4.5$
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Question 591 Mark
Find the product:
0.745 × 12
Answer
On dividing the decimal by 1000 and multiplying the numbers, we get,
$\frac{745}{1000}\times12$
$=\frac{8940}{1000}$
$=8.94$
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Question 641 Mark
Write the following as decimals:
$\frac{8}{100}$
Answer
$\frac{8}{100}$
Mark the decimal point two place from right to left,
$=\frac{8}{100}$
$=0.08$
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Question 651 Mark
Find:
10.05 × 1.05
Answer
$10.05 × 1.05$
$\frac{1005}{100}\times\frac{105}{100}$
$=\frac{105525}{10000}$
$=10.5525$
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