Fraction Rules
What is a strategy to simplify fractions? What do we use?
Use multiplication facts or divide by least common factor.
2/3 * 4/5
8/15
Eight friends share 12 burritos equally. How many burritos does each friend get?
12/8 or 1 1/2
What is the reciprocal of
11/8
8/11
Multiply straight across (multiply numerators and multiply denominators)
How do we change a whole number into a fraction?
Put a 1 in the denominator, or put it over 1.
3/5 * 7/8
21/40
Five bakers share 2 loaves of bread equally. What fraction of a loaf of bread does each baker get?
2/5
1/8 -: 3
1/24
All fractions are also what type of problem?
Division problem
3 word phrase to help us with dividing fractions.
Keep - Change - Flip
4 * 7/8
7/2 or 3 1/2
A baker has 6 loaves of bread. Each loaf weighs 1 pound. He cuts each loaf into thirds. How many 1/3 pound loaves of bread would the baker have?
6 x 3= 18
6 -: 1/8
48
How do we convert a mixed number into a fraction?
Use the "C" method. Multiply the denominator with the whole number and add the numerator.
When dividing fractions, you are changing into ______________________ fractions?
multiplying
5/12 * 9
15/4 or 3 3/4
There are 12 students in a jewerly-making class and 8 sets of charms. What fraction of a set of charms will each student get?
2/3
1/2 -: 5
1/10
What is the first rule in dividing fractions?
Keep fraction the same.
What should you do first to mixed numbers when multiplying or dividing fractions?
Convert them to improper fractions.
Change them to improper fractions.
Make them improper fractionns.
Emmett stopped at the farm stand to buy peaches. The peaches cost $1.35 per pound. Emmett bought 4 peaches that weighed a total of 1.6 pounds. How much did Emmett pay for the peaches?
$.021
$2.16
$21.60
$216.00
$2.16
$1.35 x 1.6= $2.16
Twelve students share three peaches equally. What fraction of a melon does each friend get?
3/12 or 1/4
1/12 -: 3
1/36
What fraction do we flip?
the second fraction