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Chapter 5

Change percent to fractions
Write number over 100 reduce to simplest form Note: if numerator has a decimal then multiply the numerator and denominator by the same power of ten to get whole number for numerator, then put in simplest form (see page 275) |

Change percent to a decimal
Write number over 100 (fraction), divide numerator by denominator (see page 276) |

Change fractions to a percent
multiply the numerator and denominator by the same number to get a 100 in the denominator. Write the numerator with the percent sign See page 281 Note: if the denominator can not be multiplied to get a 100, change to decimal than a percent |

Change decimal to percent
Multiply the decimal number by 100 add percent sign See page 281 |

Change fractions to decimals
Divide numerator by denominator |

Change decimal to fractions
Write the number as a whole number in the numerator Write the place value as the denominator See top of page 282 |

Fractions Chapter 2

Fractions

**Adding**

Find a common denominator.

Add the numerators.

Keep the denominator the same

For example: Â½ + Â¼ = Â½ (2/2) = 2/4 + Â¼

2/4 + Â¼ = Â¾

**Subtracting**

Find a common denominator.

Subtract numerators

Keep the denominator the same

Example: Â½ – Â¼ = Â½ (2/2) = 2/4 – Â¼

2/4 – Â¼ =Â¼

**Multiplying **

Multiply the numerator by the numerator

Multiply denominator by the denominator.

Simplify product if possible.

Example: Â½ x Â¼ = â…›

**Division**

Use the formula** Keep Change Flip **(KCF)

Keep the Dividend change the division sign to a multiplication sign and flip the divisor.

Example: Â½ divided by Â¼

= Â½ x 4/1

= 4/2 or 2

Sept. 27, 2018 Chapter 1

For adding and subtracting Decimals:

- Align the numbers so that the decimals are arranged in a vertical line (one on top of the other)
- Perform operation add or subtract

For multiplying decimals:

- Multiply the numbers without the decimals
- Count the number of digits after the decimal in both factors.
- Place the decimal in the product by counting back (right to left) the number of digits counted in step 2.

For division of a decimal by a whole number:

- Place the decimal point in the quotient directly above the decimal point in the dividend
- Divide the numbers

Divide decimals when the divisor has a decimal:

- Rewrite the divisor as a whole number
- Whatever we do to the divisor we do to the dividend
- Place the decimal in the quotient
- Divide