Q.1. Add integers:

(i) 400, –31, –71

(ii) 937, (–37), 100, –200, 300

(iii)100, –100, 200, –45

(iv) 200, –30, 90, –450

(v) –230, –400, 500, –250

(vi) 90, –85, 234,
–134

Q.2. Subtract first integer from second:

(i) –17, –34

(ii) 2, –15.

Q.3. Find the value of the following:

(i) (–23) (–20) 5

(ii) (–3) (–4) (–6) (–30)

(iii) 38 + (–109) + 200 – (– 300)

(iv) 6 (–15) + 14 15

(v) (–22) (–11)

(vi) (–24) (–8).

Q.4. Verify the following results:

(i) 20 [ 5 (–16)] = [20 5] (–16)

(ii) 18 [100 + (–5) ] = 18 100 + 18 (–5).

Q.5. Find the pair (a, b) such that a ÷ b = – 3.

Q.6. Find the value of 30125 ×99 – (– 30125) using property.

Q.7. Arrange in ascending order:

–7, –3, 0, –10, 4, 6, –5, –33, 19, and 11.

Q.8. Which is the integer whose product with (–2) is (–150)?

Q.9. Compute the following by suitable grouping:

1. 25×7×4×3

2. (–15) + 24 + 5 + (–4)

Q.10. Give the additive inverse of the following:

1. 15

2. –23

3. 0

4. – (–60)

Q.11. What will be the sign of the product if we multiply together:

1. 10 negative integers and 1 positive integer?

2. 11 negative integers and 3 positive integers?

Q.12. Calculate the following:

a. 35 ÷ (–5)

b. 0 × (–2)

c. –275 + ___ = 1

d. (–59) + 1

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