7th Maths | Exercise 1.1 Full | Term 1 | Number System | AlexMaths | TamilNadu



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2. Say true or false.
(i) The additive inverse of (–32) is (–32)
(ii) (−90)+( −30) = 60
(iii) (−125)+25 = −100
3. Add the following
(i) 8 and –12 using number line (ii) (–3) and (–5) using number line
(iii) (−100)+(−10) (iv) 20 +(−72)
(v) 82 +(−75) (vi) −48 +(−15)
(vii) −225 +(−63)
4. Thenmalar appeared for competitive exam which has negative scoring of 1 mark for each incorrect answer. In paper I she answered 25 questions incorrectly and in paper II, 13 questions incorrectly. Find the total reduction of marks.
5. In a quiz competition, Team A scored +30,–20, 0 and team B scored –20, 0, +30 in three successive rounds. Which team will win? Can we say that we can add integers in any order?
6. Are (11+ 7)+10 and 11+(7 +10) equal? Mention the property.
7. Find 5 pairs of integers that add up to 2
8. The temperature at 12 noon at a certain place was 18 ° above zero. If it decreases at the rate of 3° per hour at what time it would be 12 ° below zero?
(i) 12 mid night (ii) 12 noon
(iii) 10 am (iv) 10 pm
9. Identify the problem with negative numbers as its answer:
(i) −9 + (−5)+ 6 (ii) 8 + (−12) − 6
(iii) −4 + 2 +10 (iv) 10+(–4)+8
10. (−10)+ (+7) = ____
(i) +3 (ii) –3 (iii) −17 (iv) +17
11. (−8)+10 + (−2) = ____
(i) 2 (ii) 8 (iii) 0 (iv) 20
12. 20 +(−9)+ 9 = ____
(i) 20 (ii) 29 (iii) 11 (iv) 38

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