Exercise
1.3
1.
Fill in the blanks.
(i)
If Arulmozhi saves ₹ 12 per day, then she saves ₹ ________ in 30 days.
(ii)
If a person ‘A’ earns ₹ 1800 in 12 days, then he earns ₹ ________ in a day.
(iii)
45 ÷ (7 + 8) − 2 = ________.
2.
Say True or False.
(i) 3 + 9 × 8 = 96 [True]
(ii) 7 × 20 − 4 = 136 [True]
(iii) 40 + (56 − 6) ÷ 2 = 45
3.
The number of people who visited the Public Library for the past 5 months were 1200,
2000, 2450, 3060 and 3200. How many people visited the library in the last 5 months.
Solution: Number of people visited the
Library in the last 5 months.
1200 + 2000 + 2450 + 3060 + 3200 = 11,910
11,910 people visited
4.
Cheran had a bank savings of ₹ 7,50,250. He withdrew ₹ 5,34,500 for educational
purpose. Find the balance amount in his account.
Solution:
Bank Savings = 7,50,250
Withdraw = 5,34,500
= 2,15,750
Balance amount = Rs. 2,15,750
5.
In a cycle factory, 1560 bicycles were manufactured every day. Find the number of
bicycles manufactured in 25 days.
Solution:
Number of bicycles manufactured for one day = 1560
for 25 days = 1560 × 25
= 39,000
6.
₹ 62500 was equally distributed as a New Year bonus for 25 employees of a company.
How much did each receive?
Solution:
Total Amount = Rs. 62500
No. of employees = 25
For one employee = 62500/25
= 2500
Each employee receive = Rs.2500
7.
Simplify the following numerical expressions:
(i)
(10 + 17) ÷ 3
Solution:
27 ÷ 3
27 / 3 = 9
(10 + 17) ÷ 3 = 9
(ii)
12 − [3 − {6 − (5 − 1)}]
Solution:
12−[3−(6−4)]
12−[3−2]
12 − 1 = 11
12−[3−{6−(5−l)}] = 11
(iii)
100 + 8 ÷ 2 + {(3 × 2) – 6 ÷ 2}
Solution:
= 100 + 8 ÷ 2 +{6−3}
= 100 + 8 ÷ 2 + 3
= 100 + 4 + 3
= 107
100 + 8 ÷ 2 + {(3 × 2) − 6 ÷ 2} = 107
Objective Type Questions
8.
The value of 3 + 5 − 7 × 1 is ________.
(a)
5
(b)
7
(c)
8
(d)
1
Answer: (d) 1
9.
The value of 24 ÷ {8 − (3 × 2)} is
(a)
0
(b)
12
(c)
3
(d)
4
Answer: (b) 12
10.
Use BIDMAS and put the correct operator in the box.
2 _____
6 – 12 ÷ (4 + 2) = 10
(a)
+
(b)
–
(c)
×
(d)
÷
Answer: (c) ×
Answers:
Exercise 1.3
1) (i) 360 (ii) 150 (iii) 1
2) (i) False (ii) True (iii) False
3) 11910
4) 2,15,750
5) 39,000 bicycles
6) ₹ 2500
7) (i) 9 (ii) 11 (ii) 107
8) (d) 1
9) (b) 12
10) (c) ×
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