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
Michelle cuts 1/4 yard of ribbon into 4 equal pieces. What is the length of each piece?
1/16 yard
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
Holly had 30 pencils. She gave 6 pencils to her friend. Three-eighths of her remaining pencls need to be sharpened. How many of Holly'spencils need to be sharpened.
9
3/8 -: 2/3
9/16
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
Caleb and 2 friends are sharing 1/2 quart ofmilk equally. What fraction of a quart of milk does each person get?
1/4
6 -: 5/8
48/5 or 9 3/5
How do we convert a mixed number into a fraction?
Multiply the denominator with the whole number and add the numerator.
When dividing fractions, you are changing your division problem to a ______________________ problem.
multiplication
5/12 * 9
15/4 or 3 3/4
Thomas makes 5 sandwiches that he cuts into thirds. How many 1/3-size sandwich pieces does he have?
15
1/2 -: 5/8
4/5
What do you do to the first number in a dividing fractions problem?
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.
2/9 * 3/8
1/12
Ming divides 1/2 of a birthday cake equally among herself and 5 friends. What fraction of the whole cake should each person get?
1/12
3/8 -: 7/12
9/14
What fraction do we flip?
the second fraction