# How to Round a Number

**To the nearest ten**

If the ones digit is 5 or more, round to the next highest ten

(68 rounds to 70).

If the ones digit is less than 5, round to the next lowest ten

(33 rounds to 30).

**To the nearest hundred**

If the tens digit is 5 or more, round to the next highest

hundred (384 rounds to 400).

If the tens digit is less than 5, round to the next lowest

hundred (427 rounds to 400).

**To the nearest thousand**

If the hundreds digit is 5 or more, round to the next highest

thousand (7,602 rounds to 8,000).

If the hundreds digit is less than 5, round to the next lowest

thousand (7,268 rounds to 7,000).

## How to Find an Average

To find the average of several numbers, add the numbers

together and then divide the

sum by the number of numbers.

The average of 17, 30, 6, and 7 = 60 ÷ 4 = 15

## How to Tell if Two Fractions are Equivalent

Cross multiply the fractions. If both products are the same,

the fractions are equivalent.

__3__and

__9__3 x 24 = 72

__3__and

__9__are equivalent fractions.

8 24 8 x 9 = 72 8 24

__5__and

__3__5 x12 = 60

__5__and

__3__are

__not__equivalent fractions.

8 12 8 x 3 = 24 8 12

To tell what percentage one number is of a second number,

divide the first number

by the second. Move the decimal point of the resulting quotient

two places to the right.

Example: What percentage is 20 of 300?

20 ÷ 300 = .067 = 6.7%

## How to Change a Fraction to a Percentage

Divide the numerator by the denominator. Move the decimal

point of the resulting quotient two places to the right.

__6__= 6 ÷ 15 = .4 = .40 = 40%

15

## How to Change a Decimal to a Percentage

Move the decimal point two places to the right.

0.792 = 79.2%

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