Download Chapter 9 Math Notes

Chapter 9 Math Notes
Lesson 9.1
Numerator: part of a whole
Denominator: total number of parts
3
5
Lesson 9.3
Equivalent Fractions
To make equivalent fractions, multiply or divide the
numerator and denominator by the same number.
Lesson 9.4
Simplest Form
1. Find the GCF (Greatest Common Factor) between
the numerator and denominator.
2. Divide the numerator and denominator by the
GCF.
**When a fraction is in simplest form, the numerator and
denominator should not have any common factors.
***To find the GCF list the common factors of each
number. Factors are numbers that multiply together to get
a product.
Lesson 9.8
Writing Fractions
Mixed number – a number with a whole number and a
fraction.
Improper fraction – a number in which the numerator is
greater than the denominator.
For whole numbers:
1. Write a denominator that is the same as the
whole number.
2. Multiply the whole number by the
denominator to get the numerator.
For mixed numbers:
1. Multiply the denominator by the whole
number.
2. Add the numerator to the product from step 1
and put your answer as the new numerator.
3. Keep the same denominator.
Lesson 9.9
Writing Mixed Numbers
1. Divide the numerator by the denominator.
2. The quotient becomes your whole number.
Any reminder becomes the numerator and you
keep the same denominator.
Lesson 9.10
Comparing and Ordering Fractions
1. Find the LCM (least common multiple) of the
denominators.
2. Write equivalent fractions using the LCM.
3. Compare the numerators and write the fractions in
order.
**If the fraction is a mixed number or whole number,
don’t forget to compare the whole numbers!
***Always write your answer using the original
fractions from the problem, not the equivalent
fractions.
Lesson 9.11 and 9.12
Changing Fractions to Decimals
There are three ways to change a fraction to a decimal.
1. If the denominator is a tenth, hundredth, or
thousandth, read the fraction and write the decimal
using the correct place value.
2. If the fraction can be changed to an equivalent
fraction with a denominator of a tenth, hundredth,
or thousandth…
 Write an equivalent fraction.
 Read the fraction and write the correct
decimal.
3. Divide the numerator by the denominator. Be sure
to add a decimal and zeros when needed.