New Learning Composite Mathematics Class 8 SK Gupta Anubhuti Gangal Powers (Exponents) Chapter 2a Solution

New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 8 Powers (Exponents) Self Practice 2a Solution

Evaluate

(1) (a) 90

(b) (1/3)0

(c) (-64/21)

(d) (395.008)0

(e) (3xy/ab –z)

(f) 1/a0 + b0 + c0

(g) (80 – 20)x 250

(h) (350 + 20 + 30) ÷ 3

(2) Simplifying giving the answer as a fraction:

(a) 6-1

(b) 10-1

(c) 4-3

(d) 2-7

(e) 3-3

(f) p-1

(g) (x-2)2

(h) (10a)-2

(i) (x + y)-2

(j) (m5)-3

SOLUTION Number 1 & 2:

(3) Find the reciprocal of the following.

(a) (3)-2

(b) (-2)-5

(c) (2/5)3

(d) (2/3)-4

(4) Simplify and express the result in power notation with positive exponent.

(a) (-2)-4 x (-2)-6

(b) 37 x 3-9 x 36

(c) 37 x (3/5)-7

(d) 2-7 x [(2)-3]-4

(f) (4-8 ÷ 4-10) x 4-5

(5) Evaluate:

(a) (80 + 5-1) x (1/5)-2

(b) (300 + 150) x (1/2)-3

(c) (7-1 + 8-1 + 9-1) ÷ (-1/9)-2

(d) [(1/3)-2 + (1/4)-2 (1/6)-2]

(e) {(-4/5)-2}-2

(f) 9-1 x 43/3-4

(g) (5-1 x 4-1) x (3/2)-2

SOLUTION Number 3, 4 & 5:

(6) Evaluate:

(a) [(1/4)-1 – (1/5)-1] + 1

(b) [(11/12)-10 ÷ (11/12)-12 ] x 1-23/121

(7) Find the value of m for which, 72m ÷ 7-4 = 7-6

SOLUTION Number 6 & 7:


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