Adding and Subtracting Fractions
What is the first step when adding or subtracting fractions with unlike denominators?
Find a common denominator before adding or subtracting fractions with different denominators.
What is a pictorial (fraction) model?
A visual way to show fractions using shapes, number lines, or fraction bars.
What is an unknown value?
A number that is missing and needs to be found.
What is an area model?
A model that shows fraction multiplication by overlapping shaded parts.
What is a unit fraction?
A fraction that names part of a whole.
What is 1/2 + 1/3
5/6
Why must fraction models be divided into equal parts?
To make sure the fractions represent equal-sized parts.
What number goes in the blank?
___+ 1/3 = 1/2
1/6
What does multiplying fractions represent when using an area model?
It shows how much of the whole is shaded twice.
If a whole is divided into 4 equal parts, what fraction does each part represent?
Each piece is 1/4
What is 3/4 - 1/2
1/4
What must you do to correctly model 1/3 + 1/4 using an area model?
Divide both models into twelfths.
What number makes this equation true?
__ - 1/4 = 7/12
5/6
What is 1/2 x 1/2?
1/4
What fraction is represented by 3 x 1/4?
3/4
What is 1 3/4 + 5/12
2 1/6
Why can a fraction bar model and a circle model both correctly represent 2/3?
Both models show the same total even though they look different.
What number belongs in the blank?
__ + 2/3 = 1 11/12
1 1/4
What is 3/4 x 1/2?
3/8
Why is multiplication used to represent fractions like 5 x 1/8?
It shows how many unit fractions make up the fraction.
Liam ran 3/4 mile in the morning and 7/12 mile in the afternoon. How many miles did he run in all?
1 1/3 miles
How would you model 3/4 - 1/2 using a pictorial or area model?
Draw a model divided into eighths and shade 3/8 and 2/8
A ribbon is 7/8 meter long. After using some ribbon, 1/2 meter remains. How much ribbon was used?
3/8
A recipe uses 1/2 of a pan of brownies. You eat 1/2 of that amount. What fraction of the whole pan did you eat?
1/4 of the pan
A student eats 6 pieces of a snack that is divided into 8 equal parts. What fraction of the snack did the student eat?
6/8 or 3/4