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# Exercise 1.2 (Subtraction of Integers)

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

10. (−100) − 0 +100 = ____

(i) 200

(ii) 0

(iii) 100

(iv) −200

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