NCERT Class 7 th Mathematics Chapter 2- Fractions and Decimals Exercise 2.5 Solutions, Exercise 2.5 Maths Solutions, Class 7th maths solutions, Solutions for NCERT Class 7 th Mathematics Chapter, CBSE Maths Class 7th Solutions, Class 7th Maths Solutions, NCERT Maths solutions for class 7th, Questions and answers of NCERT class 7th Mathematics, NCERT Class 7th Mathematics Chapter 2- Fractions and Decimals Exercise 2.5 Solutions.
Please find the detailed Solutions for class 7th Maths Chapter 2- Fractions and Decimals Exercise 2.5 Solutions, you can check all the solutions from here chapter wise
NCERT Class 7th Mathematics Chapter 2- Fractions and Decimals Exercise 2.5 Solutions
Exercise 2.5
1. Which is greater?
(i) 0.5 or 0.05
(ii) 0.7 or 0.5
(iii) 7 or 0.7
(iv) 1.37 or 1.49
(v) 2.03 or 2.30
(vi) 0.8 or 0.88
Ans. (i) 0.5 is greater than 0.05
(ii) 0.7 is greater than 0.5
(iii) 7 is greater than 0.7
(iv) 1.49 is greater than 1.37
(v) 2.30 is greater than 2.03
(vi) 0.88 is greater than 0.8
2. Express as rupees using decimals :
(i) 7 paise
(ii) 7 rupees 7 paise
(iii) 77 rupees 77 paise
(iv) 50 paise
(v) 235 paise.
Ans. We know 1 Rupee = 100 paise
1 paisa = 1/100 Rupee
(i) 7 paise = 7/100 Rupee = 0.07 Rupee
(ii) 7 rupees 7 paise = Rs. 7 + 71/00 Rupee = Rs. 7 + 0.07 Rupee = Rs. 7.07
(iii) 77 rupees 77 paise = Rs. 77 + 77/100 Rupee = Rs. 77 + 0.77 Rupee = Rs. 77.77
(iv) 50 paise = 50/100 = 0.50 Rupee
(v) 235 paise = 235/100 = Rs. 2.35 Rupee
3. (i) Express 5 cm in metre and kilometre
(ii) Express 35 mm in cm, m and km
Ans. (i) We know 100 cm = 1 m
1 cm = 1/100 m
5 cm = 5/100 m = 0.05 m
Now, 1000 m= 1 km
1 m = 1/1000 km
0.05 m = 0.05/1000 km = 0.00005 km
(ii) 10 mm = 1 cm
1 mm = 1/10 cm
35 mm = 35/10 = 3.5 cm
Now, 100 cm = 1 m
1 cm = 1/100 m
3.5 cm = 3.5/100 m = 0.035 m
Now, 1000 m = 1 km
1 meter = 1/1000 km
0.035 m = 0.035/1000 km = 0.000035 km
4. Express in kg:
(i) 200 g (ii) 3470 g (iii) 4 kg 8 g
Ans. We know that 1000 g = 1 kg
Therefore 1 g = 1/1000 kg
(i) 200 g = 200/1000 kg = 0.200 kg = 0.2 kg
(ii) 3470 g = 3470/1000 kg = 3.740 kg
(iii) 4 kg 8 g = 4 kg + 8/1000 kg = 4 kg + 0.008 kg= 4.008 kg
5. Write the following decimal numbers in the expanded form:
(i) 20.03 (ii) 2.03 (iii) 200.03 (iv) 2.034
(i) 20.03 = 2 x 10 + 0 x 1 + 0 x 1/10 + 3 x 1/100
(ii) 2.03 = 2 x 1 + 0 x 1/10 + 3 x 1/100
(iii) 200.03 = 2 x 100 + 0 x 10 + 0 × 1 + 0 x 1/10 + 3 x 1/100
(iv) 2.034 = 2 × 1 + 0 x 1/10 + 3 x 1/100 + 4 x 1/1000
6. Write the place value of 2 in the following decimal numbers:
(i) 2.56 (ii) 21.37 (iii) 10.25 (iv) 9.42 (v) 63.352.
Ans. (i) Place value of 2 in 2.56 = 2 x 1 = 2 ones
(ii) Place value of 2 in 21.37 = 2 x 10 = 2 tens
(iii) Place value of 2 in 10.25 = 2 x 1/10 = 2 tenths
(iv) Place value of 2 in 9.42 = 2 x 1/100 = 2 hundredth
(v) Place value of 2 in 63.352 = 2 x 1/1000 = 2 thousandth
7. Dinesh went from place A to place B and from there to place C. A is 7.5 km from B and B is 12.7 km from C. Ayub went from place A to place D and from there to place C. D is 9.3 km from A and C is 11.8 km from D. Who travelled more and by how much?
Ans. Total distance covered by Dinesh = AB + BC
= 7.5 + 12.7 = 20.2 km
Total distance covered by Ayub = AD + DC
= 9.3 + 11.8 = 21.1 km
On comparing the total distance of Ayub and Dinesh,
21.1 km > 20.2 km
Therefore, Ayub covered more distance by 21.1 – 20.2 = 0.9 km = 900 m
8. Shyama bought 5 kg 300 g apples and 3 kg 250 g mangoes. Sarala bought 4 kg 800 g oranges and 4 kg 150 g bananas. Who bought more fruits?
Ans.Total weight of fruits bought by Shyam = 5 kg 300 g + 3 kg 250 g = 8 kg 550 g = 8.550 kg
Total weight of fruits bought by Sarala = 4 kg 800 g + 4 kg 150 g = 8 kg 950 g = 8.950 kg
On comparing the quantity of fruits,
8.550 kg < 8.950 kg
Therefore, Sarala bought more fruits.
9. How much less is 28 km than 42.6 km?
Ans. We have to find the difference of 42.6 km and 28 km.
42.6 – 28.0 = 14.6 km
Therefore 14.6 km less is 28 km than 42.6 km.
You can find the solutions for previous exercise from here
- Class 7th Maths – Exercise 2.4 Solutions
- Class 7th Maths – Exercise 2.3 Solutions
- Class 7th Maths – Exercise 2.2 Solutions
- Class 7th Maths – Exercise 2.1 Solutions
- Class 7th Maths – Exercise 1.4 Solutions
- Class 7th Maths – Exercise 1.3 Solutions
You can find solution for whole chapter here –
