The DAV Maths Book Class 5 Solutions and **DAV Class 5 Maths Chapter 6 Brain Teasers** Solutions of Addition and Subtraction of Decimal Numbers offer comprehensive answers to textbook questions.

## DAV Class 5 Maths Ch 6 Brain Teasers Solutions

Question 1.

Tick (✓) the correct answers.

(a) How much is 40 more than 12.25?

(i) 27.75

(ii) 28.25

(iii) 27.25

(iv) 28.75

Solution:

We have to subtract to compare the decimal number

So, option (i) is correct.

(b) The digit in the hundredths place in the sum of 3.42, 6.2, and 2.473 is-

(i) 3

(ii) 0

(iii) 2

(iv) 9

Solution:

First, find the sum

So, option (iv) is correct.

(c) 109.93 + _____ = 349.109

(i) 239.179

(ii) 240.179

(iii) 249.279

(iv) 239.279

Solution:

We have to subtract.

So, option (i) is correct

(d) The difference between the greatest and the smallest numbers in the given set of numbers is-

7.018, 7.108, 7.810, 7.081

(i) 0.090

(ii) 0.792

(iii) 0.729

(iv) 0.027

Solution:

Greatest number = 7.810

Smallest number = 7.018

Difference = 0.792

option (ii) is correct.

(e) 0.1 + 0.001 – 0.01 = _____

(i) 0.091

(ii) 0.910

(iii) 0.901

(iv) 0.019

Solution:

option (i) is correct

Question 2.

Find the sum or difference of the following:

(a) 111.1 + 11.11 + 1.111

Solution:

(b) 200.8 – 178.865

Solution:

(c) 43 – 28.625

Solution:

(d) 85 + 8.583 + 85.1

Solution:

Question 3.

The sum of two decimal numbers is 0.9. If one of them is 0.675, find the others.

Solution:

To find the other, we have to subtract it.

The sum of two decimal numbers = 0.900

One of the Numbers = -0.675

Another number = 0.225

Another number is 0.225

Question 4.

A tower is painted in red, white, and black. If 25.5 m is painted red, 15.75 m in black, and 10.25 in white, find the height of the tower.

Solution:

To find the height of the tower, we have to add all the portions.

Length of tower painted red = 25.50

Length of tower painted black = 15.75

Length of tower painted white = +10.25

Height of tower = 51.50

The height of the tower is 51.50 m

Question 5.

The sum of three decimal numbers is 95.3. If two decimal numbers are 43.82 and 26.058 respectively, find the third number.

Solution:

We have to subtract it, the sum of two decimal numbers from the sum of three decimal numbers.

One decimal number = 43.820

Other decimal number = +26.058

The sum of two decimal numbers = 69.878

The sum of three decimal numbers = 95.300

The sum of two decimal numbers = -69.878

Third number = 25.422

The third decimal number is 25.422

Question 6.

Complete the following magic square so that the decimal numbers from left to right and top to bottom add upto to 4.5.

Solution:

IInd row = 1.3 + 1.5 + 1.7 = 4.5

Ist column r1 = 4.5 – (1.3 + 1.4)

= 4.5 – 2.7

= 1.8

For column r2 = 4.5 – (1.1 + 1.5)

= 4.5 – 2.6

= 1.9

For row r3 = 4.5 – (1.8 + 1.1)

= 4.5 – 2.9

= 1.6

For column r4 = 4.5 – (1.6 + 1.7)

= 4.5 – 3.3

= 1.2

Additional Questions

Question 1.

Add.

(a)

Solution:

4.28

(b)

Solution:

3.914

(c)

Solution:

219.86

(d)

Solution:

62.368

Question 2.

Arrange in columns and add.

(a) 3.6 + 5.776 + 0.36

Solution:

(b) 191.3 + 0.236 + 1.133

Solution:

(c) 12.805 + 7.37 + 0.133

Solution:

Question 3.

Subtract.

(a) 7.30 from 9.135

Solution:

(b) 18.355 from 20.13

Solution:

(c) 91.013 from 103.56

Solution:

(d) 33.12 from 90

Solution:

Question 4.

Mr Sahni spent ₹ 50 on shaving, ₹ 90.50 on repairing shoes, and ₹ 120.75 on fruits. Find the total amount he spent.

Solution:

Money spent on shaving = ₹ 50.00

Money spent on repairing shoes = ₹ 90.50

Money spent on fruits = + ₹ 120.75

Amount he spent = ₹ 261.25

The total money he spent is ₹ 261.25.

Question 5.

Fill in the blanks.

(a) 123.50 – _____ = 123.50

Solution:

0

(b) 56.25 – _____ = 0

Solution:

56.25

(c) 430.30 – _____ = 430.30

Solution:

0

(d) 76.361 – _____ = 0

Solution:

76.361

(e) 96.3 – 0 = _____

Solution:

96.3

(f) 79.89 – _____ = 0

Solution:

79.89

Question 6.

Tick (✓) the correct answers.

(a) How much is 80 more than 39.156?

(i) 40.344

(ii) 40.844

(iii) 40.130

(iv) 40.220

Solution:

(ii) 40.844

(b) If we add 0 to 1.339 the answer will be

(i) 1.439

(ii) 1.379

(iii) 1.339

(iv) 1.439

Solution:

(iii) 1.339

(c) 0.624 + 1.234 + 1.8 – 2.555

(i) 1.35

(ii) 1.39

(iii) 0.955

(iv) 1.103

Solution:

(iv) 1.103

Question 7.

Write the digit in the tenths place in the sum of 7.351, 9.253, and 3.56.

Solution:

1

Question 8.

The sum of the two numbers is 107.36. If one of the numbers is 36.7. Find the other number.

Solution:

The sum of two numbers = 107.36

One of the numbers = 36.7

other number = 70.66

Question 9.

Solve

(a) 12.480 + 13.990 – 10

Solution:

16.470

(b) 48.620 + 28.03 – 33.006

Solution:

43.644

(c) 156 + 65.3 – 200.008

Solution:

21.292

(d) 137.12 + 329.1 – 222.463

Solution:

243.757

Question 10.

The length of a wall painted black and white is 156.360 m. 90.76 m is painted black. Find the portion painted white.

Solution:

Length of a wall painted black and white = 156.360 m

Length of a wall painted black = 90.76 m

Length of a wall painted white = 65.6 m

Question 11.

The sum of three decimal numbers is 115.78. If two decimal numbers are 20.368 and 56.12 respectively. Find the third number.

Solution:

The sum of three decimal numbers = 115.78

Sum of two decimal numbers = 20.368 + 56.12 = 76.488

the third number = 39.292