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Adding and
Subtracting Fractions
Performance Task Objectives
- Add fractions with like
and unlike denominators
- Subtract fractions with
like and unlike denominators
- Estimate sums and differences
of mixed numbers
- Add and subtract mixed numbers
with like and unlike denominators
- Solve problems that involve
number sense
Sunshine State Standards
Materials
- Student recording sheet
- Customary measuring tapes
or yardsticks
- Calculator (optional)
Student arrangement
Task
Present the problem on the student Recording Sheet to your students.
Performance Criteria
- Is the student able to determine
different fractional amounts needed for an individual recipe?
- Does the student add or
subtract correctly?
- Does the student reasonably
determine the amount of snack mix needed for the whole class?
Directions:
Congratulations! Your class has just won first place in your school’s
Olympic Field Day. For the celebration treat, each student will be allowed
to make one cup of snack mix to eat.
You may select from these ingredients: coconut, raisins, marshmallows,
chocolate chips, cereal, and peanuts.
1 . Choose 3 ingredients from the above list. Write a recipe for 1 cup
of snack mix you would like for yourself. Use fractions, but do not
use equal amounts of any ingredients.
2. Now write a recipe for a
class of 24 students, using all ingredients, but different amounts
of each ingredient. Only 1 ingredient may be a whole number.
3. OOPS!! Someone is allergic to peanuts; therefore, peanuts will
not be included in the recipe for the class. Now, what would be the total
number of cups of snack mix without the peanuts?
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