ICSE New mathematics today class 7 Ex- 4A Questions & answers| written by op malhotra,Sk gupta,Anubhuti Gangal:- Tech World 

 Express the following in exponential form.

1) 3/4×3/4×3/4×3/4×3/4

Ans:- (3/4)^5

2) -2/5×-2/5×-2/5×-2/5×-2/5

Ans:- (-2/5)^6

3) -10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17×-10/17

Ans:-(- 10/17)^9

Express each of the following as a number of the form P by q.

1) (3/5)^2

Ans:- 9/5

2) (2/9)^3

Ans:- 8/729

3) (-2/3)^7

Ans:- (-128/2187)

4) (-5/3)^3

Ans:- (-125/27)

5) (-1/2)^8

Ans:- 1/256

Express each of these rational numbers in power notation.

1) 27/64

Ans:- 3/4^3

2) 81/121

Ans:- 9/11^2

3) -8/125

Ans:--2/5^3

4)-1/512

Ans:--1/8^3

5) -32/243

Ans:--2/3^5

Find the value of

1) 1/4^3×4/3^2

Ans:- 1/36

2) -2/5^4×-5/4^3

Ans:--1/20

3)-3/7^3×-7/9^2

Ans:--1/21

4)-6/11^2×-11^3

Ans:- -396

5) -1/6^3÷-5/18^2

Ans:- -3/50

6) -1/8^3×-1^105×8/5^2

Ans:- 1/200

7) 1/2^4÷1/3^4+-1/2^3

Ans:- 79/16

8) (-3/5^3+7/25)×5/2^3

Ans:- 1

9) (12^2-5^3)×-1^40/19

Ans:- 1

Find the reciprocal of

1) 2/5^4

Ans:- 5/2^4

2) -3/4^3

Ans:- -4/3^3

3) -2^4

Ans:--1/2^4

4) -3/7^2

Ans:--7/3^2

5) -11/4^3

Ans:-  -4/11^3

6) -1/8^208

Ans:- -8^208

7) -1/10^47

Ans:- -10^47

8) -3/17^89

Ans:-  -17/3^89

Find the absolute value of

1) 3/4^3

Ans:- 27/64

2) -(7/8)^2

Ans:- -49/64

3) -2/3^4

Ans:- 16/81

4) -3/2^5

Ans:- -243/32

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