Decimal Fractions

decimal fractions

Step by Step solutions of RS Aggarwal ICSE Class-6 Maths chapter 5- Decimal Fractions by Goyal Brothers Prakashan is provided.

Table of Contents

Exercise: 5-D

Q1: Add:

i. 27.6, 8.93, 0.759, 9.6

Step: Add numbers in column format:

  27.600
+  8.930
+  0.759
+  9.600
--------
 46.889

Answer: 46.889

ii. 0.83, 8.07, 17.9, 294.678

Step: Add numbers in column format:

   0.830
+  8.070
+ 17.900
+294.678
--------
 321.478

Answer: 321.478

iii. 0.53, 7.07, 77.7, 0.835

Step: Add numbers in column format:

   0.530
+  7.070
+ 77.700
+  0.835
--------
 86.135

Answer: 86.135

iv. 9.38, 3.895, 109.5, 72.87, 0.005

Step: Add numbers in column format:

   9.380
+  3.895
+109.500
+ 72.870
+  0.005
--------
 195.650

Answer: 195.65

v. 9.008, 27.689, 247.96, 39.8

Step: Add numbers in column format:

   9.008
+ 27.689
+247.960
+ 39.800
--------
 324.457

Answer: 324.457

vi. 325.7, 98.079, 0.87, 236.68

Step: Add numbers in column format:

 325.700
+ 98.079
+  0.870
+236.680
--------
 661.329

Answer: 661.329


Q2: Find the difference:

i. \(17.05 – 9.78\)

 17.05
- 9.78
------
  7.27

Answer: 7.27

ii. \(30.23 – 17.495\)

 30.230
-17.495
-------
 12.735

Answer: 12.735

iii. \(107.5 – 58.69\)

107.500
-58.690
-------
 48.810

Answer: 48.81

iv. \(60 – 18.35\)

 60.00
-18.35
------
 41.65

Answer: 41.65

v. \(48.3 – 29.571\)

 48.300
-29.571
-------
 18.729

Answer: 18.729

vi. \(100 – 72.745\)

100.000
-72.745
-------
 27.255

Answer: 27.255

vii. \(215.4 – 69.845\)

215.400
-69.845
-------
145.555

Answer: 145.555

viii. \(1.5 – 0.703\)

 1.500
-0.703
------
0.797

Answer: 0.797

ix. \(42 – 0.764\)

42.000
-0.764
------
41.236

Answer: 41.236


Q3: Simplify:

i. \(74.8 + 68.79 – 47.609 – 7.08\)

Step 1: Add \(74.8 + 68.79 = 143.59\)
Step 2: Subtract \(143.59 – 47.609 = 95.981\)
Step 3: Subtract \(95.981 – 7.08 = 88.901\)

 74.800
+68.790
-------
143.590
-47.609
-------
 95.981
 -7.080
--------
 88.901

Answer: 88.901

ii. \(68.3 – 102.735 + 217.96 – 37.7\)

Step 1: \(68.3 – 102.735 = -34.435\)
Step 2: \(-34.435 + 217.96 = 183.525\)
Step 3: \(183.525 – 37.7 = 145.825\)

  68.300
-102.735
--------
 -34.435
+217.960
--------
 183.525
 -37.700
--------
 145.825

Answer: 145.825

iii. \(203.5 – 43.76 – 9.89 – 13.086\)

Step 1: \(203.5 – 43.76 = 159.74\)
Step 2: \(159.74 – 9.89 = 149.85\)
Step 3: \(149.85 – 13.086 = 136.764\)

203.500
-43.760
--------
159.740
 -9.890
--------
149.850
-13.086
--------
136.764

Answer: 136.764

iv. \(77.7 – 7.555 – 5.77\)

Step 1: \(77.7 – 7.555 = 70.145\)
Step 2: \(70.145 – 5.77 = 64.375\)

 77.700
 -7.555
--------
 70.145
 -5.770
--------
 64.375

Answer: 64.375


Q4: What is to be added to 73.6 to get 91.03?

Step 1: Let the number to be added be \(x\).
Then,
\(73.6 + x = 91.03\)
Step 2: Subtract 73.6 from 91.03 to find \(x\):

 91.030
-73.600
-------
 17.430

Answer: 17.43


Q5: What is to be subtracted from 6.1 to get 0.785?

Step 1: Let the number to be subtracted be \(x\).
Then,
\( 6.1 – x = 0.785\)
Step 2: Rearranging:
\( x = 6.1 – 0.785 \)
Step 3: Subtract:

 6.100
-0.785
-------
 5.315

Answer: 5.315


Q6: By how much should 32.987 be increased to get 60?

Step 1: Let the number to be added be \(x\).
Then,
\(32.987 + x = 60\)
Step 2: Rearranging to find \(x\):
\(x = 60 – 32.987\)
Step 3: Perform the subtraction:

 60.000
-32.987
--------
 27.013

Answer: 27.013


Q7: By how much should 72.5 be decreased to get 18.76?

Step 1: Let the number to be subtracted be \(x\).
Then,
\(72.5 – x = 18.76\)
Step 2: Rearranging the equation to find \(x\):
\(x = 72.5 – 18.76\)
Step 3: Perform the subtraction:

 72.500
-18.760
--------
 53.740

Answer: 53.74


Q8: The sum of two numbers is 34.02. If one of the numbers is 16.268, find the other.

Step 1: Let the other number be \(x\).
Then,
\(x + 16.268 = 34.02\)
Step 2: Rearranging the equation:
\(x = 34.02 – 16.268\)
Step 3: Perform the subtraction:

 34.020
-16.268
--------
 17.752

Answer: 17.752


Q9: Sajal bought a geometry box for ₹139.75 and an exercise book for ₹59.60 from a book shop. He gave a 500-rupee note to the shopkeeper. What amount did he get back?

Step 1: Total cost of items:

 139.75
+ 59.60
-------
 199.35

Step 2: Subtract total cost from ₹500:

 500.00
-199.35
--------
 300.65

Answer: ₹300.65


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