Standard index form is also known as standard form. It is very useful when writing very big or very small numbers.

In standard form, a number is always written as: A × 10 ^{n}

A is always between 1 and 10. n tells us how many places to move the decimal point.

**Example : **Write 15 000 000 in standard index form.

**Solution**

15 000 000 = 1.5 × 10 000 000

This can be rewritten as:

1.5 × 10 × 10 × 10 × 10 × 10 × 10 × 10

= 1. 5 × 10 ^{7}

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