ML Aggarwal Solutions for Class 7 Maths Chapter 4 Exponents and Powers

An exponent or power is a mathematical representation that indicates the number of times that a number is multiplied by itself. If a number is multiplied by itself m times, then it can be written as: a x a x a x a x a…m times = am Here, a is called the base, and m is called the exponent or power or index. In general, an is a power where a is the base and n is the exponent. For example, 63 is the power which shows that 6 is multiplied by itself three times. Powers of exponential expressions with the same base can be simplified by multiplying exponents. An expression with exponent zero is defined as 1. An expression with a negative exponent is defined as a reciprocal. The power of a product of factors is the same as the product of the powers of the same factors. This chapter includes laws of exponents, expressing large numbers in standard form, numbers in expanded form, square root.