Add, subtract, multiply & divide Fraction

Adding, Subtracting, Multiplying and Dividing Fractions

Adding and Subtracting Fractions

1) Turn mixed numbers into improper fractions

2) Find the least common denominator

3) Change both fractions so they have a common denominator

4) Add or subtract the fractions

5) Change back into a mixed number if necessary

​To Add or Subtract fractions...

​You must have a common denominator

Adding Fractions - Example

Multiplying Fractions

1) Change mixed numbers and whole numbers into improper fractions

2) Cross cancel and multiply across

OR

2) Multiply across and simplify

3) Change back into a mixed number if necessary

​When multiplying

​Do not forget to cross cancel when you can. Multiply the numerators, and multiply the denominators

Multiplying Fractions - Example

Dividing Fractions

1) Change mixed numbers and whole numbers into improper fractions

2) Keep, change, flip

3) Cross cancel and multiply across

OR

3) Multiply across and simplify

4) Change back into a mixed number if necessary

​To divide fractions

​Invert (Flip) the second fraction, then multiply.

​S I M P L I F Y when you can

​KCF

Dividing Fractions - Example

Multiple Choice

$$\frac{5}{6}\times\frac{1}{5}$$  

• $$\frac{6}{25}$$  

• $$\frac{1}{6}$$  

Multiple Choice

$$\frac{2}{3}+\frac{1}{4}$$  

• $$\frac{3}{7}$$  

• $$\frac{11}{12}$$  

Multiple Choice

$$\frac{5}{6}\times\frac{1}{5}$$  

• $$\frac{6}{25}$$  

• $$\frac{1}{6}$$  

Multiple Choice

$$\frac{9}{10}-\frac{1}{5}$$  

• $$\frac{7}{10}$$  

• $$\frac{8}{5}$$  

Multiple Choice

$$\frac{1}{2}\div\frac{2}{3}$$  

• $$\frac{2}{6}$$  

• $$\frac{3}{4}$$  

Multiple Choice

$$\frac{9}{10}-\frac{1}{5}$$  

• $$\frac{7}{10}$$  

• $$\frac{8}{5}$$  

Multiple Choice

$$\frac{4}{5}\div\frac{1}{5}$$  

• $$\frac{4}{25}$$  

• 4

Fractions

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