Selina Solutions Concise Maths Class 7 Chapter 4 Decimal Fractions (Decimals) Exercise 4B help students understand the steps to be followed in addition and subtraction of decimals. Our set of expert faculty at BYJUâ€™S strive hard to provide students with ready-made answers for reference purposes. Students can understand the other methods, which can be followed in answering the problems. To boost the academic performance of students, Selina Solutions Concise Maths Class 7 Chapter 4 Decimal Fractions (Decimals) Exercise 4B, PDF links are available here for free download.

## Selina Solutions Concise Maths Class 7 Chapter 4: Decimal Fractions (Decimals) Exercise 4B Download PDF

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**1. Add: **

**(i) 0.5 and 0.37 **

**(ii) 3.8 and 8.7**

**(iii) 0.02, 0.008 and 0.309**

**(iv) 0. 4136, 0. 3195 and 0.52**

**(v) 9.25, 3.4 and 6.666**

**(vi) 3.007, 0.587 and 18.341**

**(vii) 0.2, 0.02 and 2.0002**

**(viii) 6. 08, 60.8, 0.608 and 0.0608**

**(ix) 29.03, 0.0003, 0.3 and 7.2**

**(x) 3.4, 2.025, 9.36 and 3.6221**

**Solution:**

**(i) 0.5 and 0.37 **

**So we get**

**0.5 + 0.37 = 0.87**

**(ii) 3.8 and 8.7**

**So we get**

**3.8 + 8.7 = 12.5**

**(iii) 0.02, 0.008 and 0.309**

**So we get**

**0.02 + 0.008 + 0.309 = 0.337**

**(iv) 0.4136, 0.3195 and 0.52**

**So we get**

**0.4136 + 0.3195 + 0.52 = 1.2531**

**(v) 9.25, 3.4 and 6.666**

**So we get**

**9.25 + 3.4 + 6.666 = 19.316**

**(vi) 3.007, 0.587 and 18.341**

**So we get**

**3.007 + 0.587 + 18.341 = 21.935**

**(vii) 0.2, 0.02 and 2.0002**

**So we get**

**0.2 + 0.02 + 2.0002 = 2.2202**

**(viii) 6.08, 60.8, 0.608 and 0.0608**

**So we get**

**6.08 + 60.8 + 0.608 + 0.0608 = 67.5488**

**(ix) 29.03, 0.0003, 0.3 and 7.2**

**So we get**

**29.03 + 0.0003 + 0.3 + 7.2 = 36.5303**

**(x) 3.4, 2.025, 9.36 and 3.6221**

**So we get**

**3.4 + 2.025 + 9.36 + 3.6221 = 18.4071**

**2. Subtract the first number from the second: (i) 5.4, 9.8(ii) 0.16, 4.3(iii) 0.82, 8.6(v) 2.237, 9.425(vi) 41 .03, 59.46(vii) 3.92. 26.86(viii) 4.73, 8.5(ix) 12.63, 36.2(x) 0.845, 3.71**

**Solution:**

**(i) 5.4, 9.8It can be written as**

**9.8 â€“ 5.4 = 4.4**

**(ii) 0.16, 4.3It can be written as**

**4.3 â€“ 0.16 = 4.14**

**(iii) 0.82, 8.6It can be written as**

**8.6 â€“ 0.82 = 7.78**

**(v) 2.237, 9.425It can be written as**

**9.425 â€“ 2.237 = 7.188**

**(vi) 41 .03, 59.46It can be written as**

**59.46 â€“ 41.03 = 18.43**

**(vii) 3.92, 26.86It can be written as**

**26.86 â€“ 3.92 = 22.94**

**(viii) 4.73, 8.5It can be written as**

**8.5 â€“ 4.73 = 3.77**

**(ix) 12.63, 36.2It can be written as**

**36.2 â€“ 12.63 = 23.57**

**(x) 0.845, 3.71**

It can be written as

3.71 â€“ 0.845 = 2.865

**3. Simplify: (i) 28.796 -13.42 â€“ 2.555(ii) 93.354 â€“ 62.82 â€“ 13.045(iii) 36 â€“ 18.59 â€“ 3.2(iv) 86 + 16.95 â€“ 3.0042(v) 32.8 â€“ 13 â€“ 10.725 +3.517(vi) 4000 â€“ 30.51 â€“ 753.101 â€“ 69.43(vii) 0.1835 + 163.2005 â€“ 25.9 â€“ 100(viii) 38.00 â€“ 30 + 200.200 â€“ 0.230(ix) 555.555 + 55.555 â€“ 5.55 â€“ 0.555**

**Solution:**

**(i) 28.796 -13.42 â€“ 2.555It can be written as**

**= 28.796 â€“ (13.42 + 2.555) **

**On further calculation**

**= 28.796 â€“ 15.975**

**= 12.821**

**(ii) 93.354 â€“ 62.82 â€“ 13.045It can be written as**

**= 93.354 â€“ (62.82 + 13.045)**

**On further calculation**

**= 93.354 â€“ 75.865**

**= 17.489**

**(iii) 36 â€“ 18.59 â€“ 3.2It can be written as**

**= 36 â€“ (18.59 + 3.2)**

**On further calculation**

**= 36 â€“ 21.79**

**= 14.21**

**(iv) 86 + 16.95 â€“ 3.0042It can be written as**

**= 102.95 â€“ 3.0042**

**On further calculation**

**= 99.9458**

**(v) 32.8 â€“ 13 â€“ 10.725 +3.517It can be written as**

**= (32.8 + 3.517) â€“ (13 + 10.725)**

**On further calculation**

**= 36.317 â€“ 23.725**

**= 12.592**

**(vi) 4000 â€“ 30.51 â€“ 753.101 â€“ 69.43It can be written as**

**= 4000 â€“ (30.51 + 753.101 + 69.43)**

**On further calculation**

**= 4000 â€“ 853.041**

**= 3146.959**

**(vii) 0.1835 + 163.2005 â€“ 25.9 â€“ 100It can be written as**

**= (0.1835 + 163.2005) â€“ (25.9 + 100)**

**On further calculation**

**= 163.2840 â€“ 125.9 **

**= 37.484**

**(viii) 38.00 â€“ 30 + 200.200 â€“ 0.230It can be written as**

**= (38.00 + 200.200) â€“ (30 + 0.230)**

**On further calculation**

**= 238.200 â€“ 30.230**

**= 207.970**

**= 207.97**

**(ix) 555.555 + 55.555 â€“ 5.55 â€“ 0.555**

**It can be written as**

**= (555.555 + 55.555) â€“ (5.55 + 0.555)**

**On further calculation**

**= 611.110 â€“ 6.105**

**= 605.005**

**4. Find the difference between 6.85 and 0.685.**

**Solution:**

The difference between 6.85 and 0.685 = 6.85 â€“ 0.685

= 6.165

**5. Take out the sum of 19.38 and 56.025, then subtract it from 200.111.**

**Solution:**

We know that the sum of 19.38 and 56.025 can be written as

19.38 + 56.025 = 75.405

We can write it as

Difference between 200.111 and 75.405

200.111 â€“ 75.405 = 124.706

**6. Add 13.95 and 1.003, and from the result, subtract the sum of 2.794 and 6.2.**

**Solution:**

We know that addition of 13.95 and 1.003 can be written as

13.95 + 1.003 = 14.953

Similarly the sum of 2.794 and 6.2 can be written as

2.794 + 6.2 = 8.994

Here the difference between 14.953 and 8.994

14.953 â€“ 8.994 = 5.959

**7. What should be added to 39.587 to give 80.375?**

**Solution:**

It is given that

Sum of two numbers = 80.375

One number = 39.587

So the other number = 80.375 â€“ 39.587 = 40.788

**8. What should be subtracted from 100 to give 19.29?**

**Solution:**

**It is given that**

**Sum of two numbers = 100**

**One number = 19.29**

**So the other number = 100 â€“ 19.29 = 80.71**

**9. What is the excess of 584.29 over 213.95?**

**Solution:**

**It is given that**

**Sum of two numbers = 584.29**

**One number = 213.95**

**So the other number = 584.29 â€“ 213.95 = 370.34**

**10. Evaluate: **

**(i) (5.4 â€“ 0.8) + (2.97 -1.462) **

**(ii) (6.25 + 0.36) – (17.2 â€“ 8.97) **

**(iii) 9.004 + (3 -2.462) **

**(iv) 879.4 â€“ (87.94 â€“ 8 .794)**

**Solution:**

**(i) (5.4 â€“ 0.8) + (2.97 -1.462) It can be written as**

**= 4.6 + 1.508**

**On further calculation**

**= 6.108**

**(ii) (6.25 + 0.36) – (17.2 â€“ 8.97) It can be written as**

**= 6.61 â€“ 8.23**

**On further calculation**

**= – 1.62**

**(iii) 9.004 + (3 – 2.462) It can be written as**

**= 9.004 + 0.538**

**On further calculation**

**= 9.542**

**(iv) 879.4 â€“ (87.94 â€“ 8 .794)**

**It can be written as**

**= 879.4 â€“ 79.146**

**On further calculation**

**= 800.254**

**11. What is the excess of 75 over 48.29?**

**Solution:**

**We know that the excess of 75 over 48.29 can be written as**

**Hence, the excess of 75 over 48.29 is 26.71.**

**12. If A = 237.98 and B = 83.47.**

**Find: **

**(i) A â€“ B **

**(ii) B â€“ A.**

**Solution:**

**(i) A â€“ B **

**It is given that A = 237.98 and B = 83.47**

**Substituting the values**

**A â€“ B = 237.98 â€“ 83.47 **

**A â€“ B = 154.51**

**(ii) B â€“ A**

**It is given that A = 237.98 and B = 83.47**

**Substituting the values**

**B â€“ A = 83.47 â€“ 237.98 **

**B â€“ A = – 154.51**

**13. The cost of one kg of sugar increases from **â‚¹**28.47 to **â‚¹**32.65. Find the increase in cost.**

**Solution:**

**Cost of sugar = **â‚¹**28.47**

**Cost of sugar is raised = **â‚¹**32.65**

**Increase in the cost of sugar = **â‚¹**32.65 – **â‚¹**28.47 = **â‚¹**4.18**