Page 20 - Maths Skills - 7

18 Maths

Exercise 1.5

1. Find the value of the following.

(i) 5 – (5 + 4 – 2) (ii) (– 21) + 8 ÷ [6 – (4)] (iii) 28 + 12 ÷ 4
(iv) 28 ÷ 10 – 9 (v) 15 – (3 × 2) – 4 (vi) 120 – 45 ÷ 15

2. Simplify.
(i) 75 – {35 × 2 – (14 × 4 + 6)} (ii) 12 – [7 – {16 – (18 – 6 + 3 – 1 )}]

(iii) 12 + 5 – [9 – {6 ÷ 2 – (6 – 12 ÷ 3) ÷ 2}] – 5 (iv) (21 – 4) × [20 + {18 + 10 – 5 }]

(v) 100 – [18 – {16 ÷ 2 – (16 – 12 ÷ 3) ÷ 3}] (vi) – 30 + {(–1) – (–2) × 3 ÷ 6 – 3 }

ASSESSMENT TIME

COMPETENCY BASED QUESTIONS 3. The product of two negative integers is always
a ___________ integer.
A. Multiple-Choice Questions
4. The integer ___________ is called the identity
1. The integer 5 more than – 4 is: element for multiplication of integers.
(i) 1 (ii) 9 5. Absolute value of – 7 – 8 is ___________ .
(iii) – 1 (iv) none of these
C. Write ‘T’ for true and ‘F’ for false statements
2. Absolute value of – 29 is:
(i) – 27 (ii) 28 1. – 2001 is the successor of – 2000.

(iii) – 26 (iv) 29 2. Square of any integer is positive.

3. The smallest positive integer is: 3. The product of a positive integer and
(i) 0 (ii) 1 a negative integer is always a positive
(iii) 2 (iv) none of these integer.

4. The additive inverse of – 7 is: 4. Zero is neither positive nor negative.
(i) – 14 (ii) 7

(iii) – 7 (iv) 14 5. (– 7) ÷ (– 7) = 1.
5. The value of (– 1) is: D. Case Study Based Questions
25
(i) – 1 (ii) 25 Fashion waste encompasses the extensive disposal of
(iii) 1 (iv) none of these clothing, accessories, and textile remnants generated
by the fashion industry. It is estimated to weigh
B. Fill in the Blanks around 92 million tons annually worldwide. Fast
fashion’s rapid cycles and trends contributes to this
1. Zero is greater than every _________ integer. waste, leading to the discarding of vast amounts of
garments and manufacturing byproducts like offcuts
2. 16 + 9 × 4 – 4 ÷ 2 = ___________.