Addition and Subtraction of Decimals

Q.

In a class test containing 15 questions, 4 marks are given for every correct answer and (–2) marks are given for every incorrect answer. ​​​​​
(i) Gurpreet attempts all questions but only 9 of her answers are correct. What is her total score?
(ii) One of her friends gets only 5 answers correct. What will be her score? [3 MARKS]

Q.

A company earns a profit of rupees 9 per bag of white cement and a loss of rupees 5 per bag of Grey cement sold

(I) The company sells 7000 bags of white cement and 6000 bags of Grey Cement in a month. what is the profit or loss

(II) what is the number of white cement bags it must sell to have neither profit nor loss if the number of Grey bags sold is 5400

Q.

In a class test $(+3)$ marks are given for every correct answer and $(-2)$ marks are given for every incorrect answer and no marks for not attempting any question.
(i) Radhika scored $20$ marks. If she has got $12$ correct answers, how many questions has she attempted incorrectly?
(ii) Mohini scores $-5$ marks in this test, though she has got $7$ correct answers. How many questions has she attempted incorrectly?
(iii) Rakesh scores $18$ marks by attempting $16$ questions. How many questions has he attempted correctly and how many has he attempted incorrectly?

Q.

July had how many weeks?

Q.

How much less is $28Km$ than $42.6Km$ ?

Q.

An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 10 m above the ground level, how long will it take to reach − 350 m.

Q.

Question 80

Heena 's father paid an electric bill of Rs. 385.70 out of a Rs. 500 note. How much change should he have received?

Q.

Arnold ate 1/4 pizza for dinner on Monday. He ate 1/6 of what was left on Tuesday. How much pizza did he eat on Tuesday

Q.

Leena bought pens which were 5 more than the number of pencils. The cost of one pencil be Rs. 2. And that of a pen be Rs 3. If Leena spent Rs. 65 to buy pens and pencils, then how many pencils did she buy?

1. 12

2. 15

3. 7

4. 10

Q. a car travels 8 kilometre along East then 15 km long north and then 152 kilometre along Southwest . What will be its distance from the starting point?

Q.

What is a difference between 68.5 and 0.685

Q.

Solve the following:

a) 44.4444.....-27.2727.....=......

b) 3.47777.....-2.85888.....=.......

c) 3.4444....*5.6666.....=.......

Q. By what number should −420 be divided to obtain 15?

1. -28
2. 28
3. 25
4. -25

Q.

If $a=i+j+k,b=i+3j+5k$ and $c=7i+9j+11k$, then the area of parallelogram having diagonals $a+b$ and $b+c$ is?

1. $4\sqrt{6}$ units

2. $\frac{1}{2\sqrt{21}}$ sq units

3. $\frac{\sqrt{6}}{2}$ sq units

4. $\sqrt{6}$ units

Q.

The weight of one packet of tea powder is 1/4 kg. The weight of 20 such packets is _________ kg.

1. 12 kg

2. 10 kg

3. 5 kg

4. 4 kg

Q.

You bought a pen for Rs.5.50 and a notebook for Rs.20.75. If you paid the shopkeeper Rs.30, how much will he return you?

1. Rs. 2.75

2. Rs. 3.75

3. Rs. 4.75

4. Rs. 1.75

Q.

Raj wants to buy the following:
A DVD player for $\$47.85$, a DVD holder for $\$21.36$ and a stereo for $\$22.01$. If he has $\$90$, how much more money is required?

1. $\$1.22$
2. $\$1.42$
3. $\$1.32$
4. $\$1.36$

Q.

A pole of a certain length has 0.35 m painted in red, 1.27 m painted in white and 3.27 m painted in black. The remaining 5.63 m is left unpainted. Calculate the cost of painting the entire pole, if painting 1 m of it costs ₹ 15.

1. ₹ 157.80

2. ₹ 158.70

3. ₹ 156.80

4. ₹ 159.60

Q.

Find the sum in each of the following:

(a) 0.007 + 8.5 + 30.08

(b) 15 + 0.632 + 13.8

(c) 27.076 + 0.55 + 0.004

(d) 25.65 + 9.005 + 3.7

(e) 0.75 + 10.425 + 2

(f) 280.69 + 25.2 + 38

Q.

0.007 + 0.07 =

1. 0.077

2. 0.7

3. 0.0007

4. 0.014

Q.

Express in kg:

(i) 200 g (ii) 3470 g (iii) 4 kg 8 g

Q. Match the addition or subtraction of decimals with the corresponding result.

1. 2.099
2. 2.109
3. 2.089
4. 2.879

Q.

Sanky got 59.25 marks in the final exams. Passing marks for the exam is 65 marks .How much more marks Sanky should have scored to pass the exam?

1. 3.5 marks

2. 4.25 marks

3. 5.75 marks

4. 5 marks

Q. Jaya needs 3.65 m of cloth to make a shirt. She has 2.02 m of cloth with her. She needs more cloth to make a shirt.

1. 1.063 m
2. 1.63 m
3. 1.53 m
4. 1.053 m

Q.

What should be subtracted from 0.4 to get 0.08

1. 0.30

2. 0.32

3. 0.23

4. 0.42

Q.

Evaluate 0.75 - 1.5 of 0.5

1. 1.50

2. 0

3. 0.50

4. 1

Q.

Sumeet purchased a book costing ₹ 24.75 and a pencil box. If he got back ₹ 32.75 when he gave a ₹ 100 note. What is the cost of the pencil box?

1. ₹ 24.75

2. ₹ 42.75

3. ₹ 42.50

4. ₹ 45.20

Q.

Jenny has to prepare a birthday cake for her friend. The following table shows the ingredients and their respective price.

If she has sugar and eggs, how much will she spend to buy the remaining items ?

1. 736.45

2. 550.45

3. 621.50

4. 667.25

Q. If one metre of cloth costs ₹10 then the cost of 10.75 metres of cloth is:

1. ₹1075
2. ₹167.5
3. ₹107.5
4. ₹1675

Q.

In a marathon of 5.75 km, a runner took a break after covering 2.8 km, and another after covering 1300 m. How much distance is yet to go (in kms)?

1. 1.65 km

2. 1.75 km

3. 1.85 km

4. 1650 meters