Add and subtract fractions

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction
• Rewrite the fractions in the simplest form. 
• Find a common denominator. 
• Make each fraction into an improper faction. 

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

• 5 1/2
• 1 1/6
• 5 5/14
• 4 19/24

8/9 - 1/3 = 

• 7/6
• 5/9
• 2/3
• 8/27

What is the lowest common denominator of 1/9 and 2/3?

• 6
• 3
• 9
• 21

What is the lowest common denominator of 1/2 and 3/7?

• 2
• 14
• 7
• 28

What is the lowest common denominator of 1/2 and 3/7?

1/5 + 2/5 =

• 1
• 3/5
• 5/3
• 1/5

2/7 + 3/7 = 

• 4/7
• 5/7
• 5/14

Oscar began his pizza delivery route with ⁴/₆ of a tank of petrol in his car. When he made it back to Dominos he had ²/₆ of a tank of petrol left. How much petrol did Oscar use? Make sure your answer is in simplest form.

• ¹/₆ tanks
• ¹/₃ tanks
• ³/₆ tanks
• ²/₆ tanks