Class 5 Maths Chapter 10 HOTS Questions - Chapter 10 - Tenths And Hundredths

Q1: Express the following as rupees using decimals
One rupee fifty five paise
(a) Rs15.5
(b) Rs1.55
(c) Rs155
(d) None of these
Ans: (b)
Sol: 1 rupee = 100 paise
1 rupee fifty five paise = 100 + 55
= 155 paise
155 paise = 155 × 0.01 Rs.
= 155 × 00.1 Rs.
= 1.55 Rs.

Q2: Express the following as rupees using decimals
Two thousand five hundred rupee five paise
(a) Rs25000.5
(b) Rs250.005
(c) Rs2500.05
(d) None of these
Ans: (c)
Sol: 1 rupee = 100 paise
Two thousand five hundred rupee five paise
= 2500.5
= 2500(100) + 5 paise
= 250000 + 5
= 250005 paise
1 paise = 0.01 Rs.
250005 paise = 0.01 × 250005
= 2500.05 Rs.

Q3: Which one of the following countries has rupees its currency?
(a) Bhutan
(b) Malaysia
(c) Maldives
(d) Seychelles
Ans: (d)

Q4: Express in meters using decimals.
9 m and 7 cm
Sol: 9m  &  7cm
9m + 7(1/100)m  ...........  As100 cm = 1 m
9m + 0.07m
= 9.07m

Q5: Kanika was given her pocket money on 1^st  Jan,2008. She puts Rs 1 on Day 1, Rs 2 on Day 2, Rs 3 on Day 3, and continued on doing so till the end of the month, from this money into her piggy bank. She also spent Rs 204 of her pocket money, and was found that at the end of the month she still has Rs 100 with her. How much money was her pocket money for the month?
Sol: 
Total pocket Money = Money in piggy bank + expenses + left
= (1 + 2 + 3 + ... + 31) + 204 + 100
= 31 x 32 / 2 + 204 + 100
= 31 x 16 + 304
= 496 x 166 + 304
= 800 Rs.

Q6: Express in meters using decimals.
419 cm
Sol: 419cm
As 100cm = 1m
1cm =  1/100
So 419cm
=  419/100 m
= 4.19m

Q7: Convert 15 m into cm
(a) 1500
(b) 15
(c) 50
(d) 1.5
Ans: (a)
Sol: Given 15m
We need to convert it into cms
We know that 100cm = 1m
⇒ 15m = 15 × 100cm
= 1500cm

Q8: Express in paise:
Rs8.40
(a) 8.4 paise
(b) 8400 paise
(c) 840 paise
(d) None of these
Ans: (c)
Sol:
(i) 3.9
3.9 × 10 = 39
3.9 × 100 = 390
3.9 × 1000 = 3900
Hence, 39,390 and 3900 are the required numbers
(ii) 2.89
2.89 × 10 = 28.9
2.89 × 100 = 289
2.89 × 1000 = 2890.00
=2890
Hence, 28.9,289 and 2890 are the required numbers
(iii) 0.0829
0.0829 × 10 = 0.829
0.0829 × 100 = 8.29
0.0829 × 1000 = 82.9
Hence, 0.829,8.29 and 82.9 are the required numbers
(iv) 40.3
40.3 × 10 = 403
40.3 × 100 = 4030
40.3 × 1000 = 40300
Hence, 403,4030 and 40300 are the required numbers
(v) 0.3725
0.3725 × 10 = 3.725
0.3725 × 100 = 37.25
0.3725 × 1000 = 372.5

Q9: On the internet, Pranay sees a grey jacket for 165 euros(euro) and a blue jacket for $180. There are exchange rates.
1euro=76.05 rupees
1 rupee=$0.0152
Work out which jacket is the cheapest and by how many rupees.
The _________ jacket is cheapest by _________ rupees.
Sol: Given cost of blue jacket is 180$
as we know that 1 rupee = 0.0152$ ⇒ 1$= 1 / 0.0152 = 65.79 rupees
1  euro =76.05 rupee
Cost of grey jacket is 165 euro =165 × 76.05 = 12,548.25  rupees
Cost of blue jacket in rupees is 180 × 65.79 = 11,842.2 rupees
Difference in the cost is 12,548.25 − 11,842.2 = 706.05 rupees
So we can say that
Blue jacket is cheapest by 706.05 rupees

Q10: Express the following as rupees using decimals
Ten paise
Sol: We know that 1 rupee=100 paise
1 paise = 1/100  Rs.
= 0.01 Rs.
Ten paise = 10×0.01
= 0.1 Rs./-

Q11: How many rupees of 1 billon.
Ans: 1 billion rupees = 100crore rupees

Q12:Express as rupees using decimals.
50 rupees 90 paise
Sol: We know that, 1 Rupee = 100 paise
50rupees90paise = (50 + 90/100)rupees = 50.90 rupees

Q13: Currencies other than Bitcoin such as Lite coin and Dash are popularly known as
Ans: Currencies other than Bitcoin such as Lite coin and Dash are popularly known as Cryptocurrencies.
There are more than 1600 cryptocurrencies operating in the world as on August 2018.
At any given point of time, any cryptocurrencies can be created anywhere around the globe.
This currency can be traded only on a Cryptocurrency exchange.

Q14: Fill in the blanks :
12 km = _____ m
Sol: 12 Km = _____ m
Since 1 Km =1000 m
∴ 12 Km =12,000 m
Hence, 12 Km =12,000 m

Q15: What do you mean by INR?
Ans: The Indian rupee (INR) is the currency of India. INR is the International Organization for Standardization currency code for the Indian rupee, for which the currency symbol is ₹.

Q16: Add (giving answer in rupees):
8paise and Rs15.36
Sol: 8paise and Rs15.36
= 8 + 15.36 / 100
Since, 100paise = Rs1 / 100paise = Rs1
= 8 + 1536
=  1544paise
Now, 1544/100 = Rs15.44
∴ 8paise and Rs15.36 = Rs15.44

Q17: Subtract:
Rs0.55 from 121 paise
Sol: Rs0.55 from 121paise
= Rs121/100 – 0.55
= Rs1.21 – 0.55
= Rs0.66
Or .66 × 100=66paise
∴ The subtraction of Rs0.55 from 121paise = 66paise

Q18: Subtract:
286paise from Rs7.02
Sol: 286paise from Rs7.02
= Rs7.02 – 286paise
= Rs7.02 – 286/100
[1Rupee = 100paise]
= Rs7.02–2.86
= Rs4.16
∴ The subtraction of 286paise from Rs7.02 is Rs4.16

Q19: What is 10 USD in INR, if 1 USD = 71.85 INR.
Sol: The Value of 10 USD = 718.5 INR.
Given in the question 1 USD = 71.85 INR.
We have to calculate the value of 10 USD in INR.
Hence we are asked to use the initial value given in the question.
And multiply it by the value we are asked in the final part in the question.
Hence from the information given in the question the value of 10 USD can be calculated as:-
By multiplying both the values to calculate the answer.
This comes out to be 71.85×10=718.5 INR.

Q20: Add (giving answer in rupees):
73 paise and Rs2.08
Sol: 73 paise and Rs2.08
= 73 + 2.08 × 100
Since, 100paise = Rs1
= 73 + 208
= 209paise
Now, 209/100 = Rs2.09
∴ 73paise+Rs2.08 = Rs2.09