7th Maths : Term 1 Unit 1 : Number System : Exercise 1.2 : Fill in the blanks, Say true or false, Find the value of the following, Objective type questions, Text Book Back Exercises Questions with Answers, Solution

**Exercise 1.2**

**1.
Fill in the blanks**

(i) − 44 + ** –44** = −88

(ii) ** 30** −75 = −45

(iii) ** –30** − ( +50) = −80

**2.
Say true or false**

(i) (−675)− (−400) = −1075** (False)**

–675 – (–400) = –675 +400 = –275

(ii) 15 − ( −18) is the same as 15 +18** (True)**

(iii) (−45)− (−8) = (−8)− (−45)** (False)**

(–45) – (–8) = –45 + 8 = –37

(–8) – (–45) = –8 + 45 =
37

**3.
Find the value of the following**

**(i)
–3–(–4) using number line**

–3 – (–4) = –3 +4 = 1

**(ii)
7–(–10) using number line**

7 – (–10) = 7 + 10 = 17

**(iii)
35 – (−64)**

35 + 64 = 99

**(iv)
−200 – (+100)**

–200 – 100 = –300

** **

**4.
Kabilan was having 10 pencils with him. He gave 2 pencils to Senthil and 3 to
Karthik. Next day his father gave him 6 more pencils, from that he gave 8 to
his sister. How many pencils are left with him?**

Kabilan has pencils = 10

He gave 2 pencils to Senthil and 3 to Karthik.

Today Kabilan has pencils = 10 – 2 – 3

= 10 – 5 = 5

Next day Father gave 6 pencils

He gave to sister 8 pencils

Now pencils left with him = 5 + 6 – 8

= 11 – 8 = 3

3 pencils are left with
Kabilan

** **

**5.
A lift is on the ground floor. If it goes 5 floors down and then moves up to 10
floors from there. Then in which floor will the lift be?**

The lift will be = –5 + 10

= 5th floor above the
ground floor.

** **

**6.
When Kala woke up, her body temperature was 102°F. She took medicine for fever.
After 2 hours it was 2°F lower. What was her temperature then?**

Body temperature = 102° F

Temperature lower = 2° F

Her temperature then = 102° F – 2° F = 100° F

** **

**7.
What number should be added to (–17) to get (–19)?**

(–17) + Number added = –19

Number added = –19 +17 = –2

The number should be added = –2

** **

**8.
A student was asked to subtract (–12) from (–47). He got −30. Is he correct?
Justify.**

–47 – (–12) = –47 + 12 = –35

He got answer = –30

His answer is wrong. Correct answer is –35

** **

__Objective type questions__

**9.
(−5) − (−18) = ____**

(i) 23

(ii) –13

(iii) 13

(iv) –23

*Answer:***(iii) 13**

**10.
(−100) − 0 +100 = ____**

(i) 200

(ii) 0

(iii) 100

(iv) −200

*Answer:***(ii) 0**

** **

**ANSWERS**

**Exercise 1.2 **

1. (i) −44 (ii) 30 (iii) −30

2. (i) False (ii) True (iii)
False

3. (i) 1 (ii) 17 (iii) 99 (iv)
−300

4. 3

5. 5th floor (above the ground
floor)

6. 100°F

7. −2

8. Wrong, −35 (correct answer)

**Objective type questions **

9. (iii) 13

10. (ii) 0

Tags : Questions with Answers, Solution | Number System | Term 1 Chapter 1 | 7th Maths , 7th Maths : Term 1 Unit 1 : Number System

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7th Maths : Term 1 Unit 1 : Number System : Exercise 1.2 (Subtraction of Integers) | Questions with Answers, Solution | Number System | Term 1 Chapter 1 | 7th Maths

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