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RCN Lesson 23: Solve Problems with Unlike Denominators

Last updated over 2 years ago
17 questions
Develop Understanding
Today's Learning Goal: (U6, L12, L13)
  • Solve problems involving addition and subtraction of fractions with unlike denominators.
Today's Materials:
  • Laptop
  • Laptop charger
  • Pen/Pencil/Paper (optional)
Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.
Reminders:
1. Ready for class
2. No cellphones
3. Volume must be low.
4. Read and follow all directions
5.) Take your bag off and immediately begin the Activator.

Jump Start: NumberTalk Sums of 1/8 - (5 min)

Find the values of the expression below.
Make sure to REDUCED to simplest form.
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Launch: Unlike Denominators (10 min)

I'll do the question 5

We'll do question 6 and 7 together

You Try question 8

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Activity 1: Priya’s Salad Dressing - (15 min)

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Priya has 2/3 cup of olive oil. She is going to borrow some more from her neighbor. How much olive oil does she need to borrow to have enough to make the dressing?

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1 tablespoon is equal to 1/16 of a cup. Priya decides that 1 tablespoon of olive oil is close enough to what she needs to borrow from her neighbor. Do you agree with Priya? Explain or show your reasoning.

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Priya says her recipe will make about
1 1/2 cups of dressing. Do you agree? Explain or show your reasoning

Activity 2: More Problems to Solve - (15 min)

(In groups of 2) You and your partner will each choose a different problem to solve and then you will discuss your solution

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Problem A: Jada is baking protein bars for a hike. She adds 1/2 cup of walnuts and then decides to add another 1/3 cup. How many cups of walnuts has she added altogether?
If the recipe requires 1 1/3 cups of walnuts, how many more cups of walnuts does Jada need to add?
(Explain or show your reasoning.)

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Problem B: Kiran and Jada hiked 1 1/2 miles and took a rest. Then they hiked another 4/10 mile before stopping for lunch. How many miles have they hiked so far?
If the trail they are hiking is a total of
2 1/2 miles, how much farther do they have to hike?
(Explain or show your reasoning.)

Lesson Synthesis: (5 min)



Today we solved problems that required adding and subtracting fractions

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What strategy did you use to find out how much salad dressing Priya’s recipe makes?

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What strategy did you use to find this difference for the olive oil?

Cool Down: Evaluate Expression - (5 min)


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Priya hiked 1 2/3 miles. Diego hiked 1/2 mile. How much farther did Priya hike than Diego?
(Explain or show your reasoning.)

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On Monday, Andre hiked 3/4 mile in the morning and 1 1/3 miles in the afternoon. How far did Andre hike on Monday?
(Explain or show your reasoning.)

Closure Questions:

How did you feel about today's material?
How do you add/subtract fractions with unlike denominators?