CBSE Class 7  >  Class 7 Notes  >  Mathematics (Maths) (Old NCERT)  >  Very Short Question Answers: Exponents and Powers

Class 7 Maths Chapter 10 Question Answers - Exponents and Powers

Q1: Find 28.
Ans: 
Given: 28
We need to find the value of the given exponent.
We can rewrite 28 to find its value as
28 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 = 256

Q2: Find (-4)3.
Ans:
Given: (-4)3
We need to find the value of a given exponent.
We can rewrite (-4)3 to find its value as
(-4)3 = -4 × -4 × -4 = -64

Q3: a0 = _____?
Ans: 
Given: a0
We need to find the value of a given expression.
We know that if 0 is the power of any number then the value of the number is always 1. Therefore, a0 = 1.

Q4: Express the following in exponential form 2 × 2 × a × a.
Ans:
Given: 2 × 2 × a × a We need to write the given expression as an exponential form. A number can be written in its exponential form if we raise the power of the number by the exponent. Therefore, exponential form of 2 × 2 × a ×a is
= 2 × 2 × a × a
= 22 × a2
= 4a2 

Q5: am × an =_______?
Ans: 
Given: am × an 
We need to fill in the blanks.
Therefore, am × an = am+n 

The document Very Short Question Answers: Exponents and Powers is a part of the Class 7 Course Mathematics (Maths) Class 7 (Old NCERT).
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