# Ncert Class 6 Math Decimals Exercise 8.4

Decimals Class 6 Ex. 8.4

New Ncert Class 6, Chapter 8 Math Free Solution.

Exercise 8.4

Question 1 :- Subtract:

(a) ₹18.25 from ₹20.75
(b) 202.54 m from 250 m
(c) ₹5.36 from ₹8.40
(d) 2.051 km from 5.206 km
(e) 0.314 kg from 2.107 kg

Solution 1:-

(a) ₹18.25 from 20.75
= 20.75 – 18.25
= 2.50

(b) 202.54 m from 250 m
= 250 m – 202.54 m
= 250.00 m – 202.54 m
= 47.46 m

(c) ₹5.36 from ₹8.40
= ₹8.40 – ₹5.36
= ₹3.04

(d) 2.051 km from 5.206 km
= 5.206 km – 2.051 km
= 3.155 km

(e) 0.314 kg from 2.107 kg
= 2.107 kg – 0.314 kg
= 1.793 kg

Question 2 :- Find the value of:

(a) 9.756 – 6.28
(b) 21.05 – 15.27
(c) 18.5 – 6.79
(d) 11.6 – 9.847

Solution 2:-
(a)  9.756 – 6.28
= 9.756 – 6.280
= 3.476

(b) 21.05 – 15.27
= 5.78

(c) 18.5 – 6.79
= 18.50 – 6.79
= 11.71

(d) 11.6 – 9.847
= 11.600 – 9.847
= 1.753

Question 3 :- Raju bought a book for ₹35.65 rupees. He gave ₹50 to the shopkeeper. How much money did he get-back from the shopkeeper?

Solution 3:-
Cost of book = ₹35.65
Money paid by him to the shopkeeper = ₹50
So, money got back by him
= ₹50 – ₹35.65
= ₹50.00 – ₹35.65
= ₹14.35

Question 4 :- Rani had ₹18.50. She bought one ice-cream for ₹11.75. How much money does she have now?

Solution 4:-
She bought ice-cream for ₹11.75
So, Money left with Rani = ₹ 18.50 – ₹11.75 = ₹6.75

Question 5 :- Tina had 20m 5cm long cloth. She cut 4m 50cm length of cloth from this for making curtain. How much cloth is left with her?

Solution 5:-
The total length of cloth had by Tina = 20 m 5 cm = 20.05 m
The length of cloth cut by her = 4 m 50 cm = 4.50 m
So, the length of cloth left with her = 20.05 m – 4.50 m = 15.55 m

Question 6 :- Namita travels 20km 50m every day. Out of this Namita travels 10km 200m by bus and the rest by auto. How much-distance does she travel by auto?

Solution 6:-
Distance travelled by Namita daily = 20km 50m = 20.050 km
Distance travelled by her by bus = 10km 200m = 10.200 km
So, Distance travelled by her by auto = (20.050 – 10.200) km = 9.850 km

Question 7 :- Aakash bought vegetables weighing 10kg. Out of this, 3kg 500g is onions, 2kg 75g is tomatoes and the rest is potatoes. What is the weight of the potatoes?

Solution 7:-
The total weight of vegetables bought by Aakash = 10 kg
The weight of onions bought by him = 3 kg 500 g = 3.500 kg and
The weight of tomatoes bought by him = 2 kg 75 g = 2.075 kg

So, the weight of potatoes = Weight of vegetable – (weight of onions + weight of tomatoes)
= 10.000 – (3.500 + 2.075)
= 10.000 – 5.575
= 4.425 kg