Adding and Subtracting Fractions

1/6 + 2/6=

1/8 + 1/2=

1/2 - 1/3 =

3/5 + 3/10 =

7/12 - 1/2

Miguel is making trail mix. He uses 5  1/3 ounces of nuts and 2  3/4 ounces of raisins.  Which of these is a reasonable estimate for how much more nuts Miguel uses than raisins?

• between 2 and 2  1/2 ounces

• between 2  1/2 and 3 ounces
  

• between 3 and 3  1/2 ounces

• between 3  1/2 and 4 ounces

Matthew has two kinds of rice: Brown (8 7/8 cups) and White (6 3/4). How much more brown rice than white rice does Matthew have?

• 2 cups

• 2 1/8 cups

• 3 1/8 cups

• 15 5/8 cups

What would be a good benchmark estimate for the fraction 1 8/10?

What would be a good benchmark estimate for the fraction 1/3?

What would be a good benchmark estimate for the fraction 2 2/5?