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Solve Real-World Problems Multiplying Fractions by Fractions

Students solve real-world and mathematical problems that require multiplying two fractions, such as finding the area of a garden plot or a fractional part of a recipe ingredient. Students represent the situation with equations and interpret their solutions.

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Solve Real-World Problems Multiplying Fractions by Fractions

Grade 5 · Multiplying Fractions in Real-World Problems · question 1 of 3

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20 rungs. A star at the top.

A garden plot is 1/3 yard long and 1/4 yard wide. What is the area of the plot?

How it is taught

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Of means multiply the two fractions.

Compare the product with the other fraction in the story.

Read it: A part of a part, in a story

1/3 of 1/8 is 1/3 × 1/8. Cut a whole 3 by 8: 24 cells. The two shades cross on 1 of them, so 1/3 × 1/8 = 1/24.

  1. Find the two fractions in the story: the amount, and the part of it that is used.
  2. Shade one fraction down a whole and the other across it.
  3. The cells inside both shades, over all the cells, are the answer, in simplest form.

Taking a fraction of a fraction is multiplying them: 1/3 of 1/8 is 1/3 × 1/8.

3 rows of 8 make 24 cells, and 1 cell is inside both shades: 1/24.

A part of a part is smaller than either part.

A fraction of a fraction: multiply the numerators and the denominators, then simplify.

Adding the two fractions, because the story uses one after the other.

The story takes a part of a part, so multiply: 1/3 × 1/8 = 1/24.

A jug has 2/5 liter of water in it. Ravi pours 1/8 of it into a cup. How much water does Ravi pour? — 1/20. 1/8 of 2/5 is 2/5 × 1/8 = 2/40 = 1/20 liter: a part of a part.

3/4 × 2/3 (garden area)

Imagine a small garden patch. It's three-fourths of a yard wide and two-thirds of a yard long. What's its area?

To find area, we multiply width by length — three-fourths times two-thirds.

Here's a square — one whole square yard — to picture this.

Grade 5 · A garden 3/4 yd wide by 2/3 yd long

Slice the square into four equal columns. Each column is one-fourth of the width.

Shade three of those columns. That's our garden's width — three-fourths.

Now slice the square into three equal rows. Each row is one-third of the height.

Shade two of the rows. That's our length — two-thirds.

The garden is where both shadings overlap. Six small rectangles fit inside it.

And the whole square is split into twelve small rectangles in all.

So the area is six out of twelve — six twelfths of a square yard.

Six twelfths simplifies. Six and twelve share a factor of six, so it becomes one half.

The garden's area is one half of a square yard. Multiplying fractions gives us a smaller piece — that makes sense!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics
Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal
1 star — one skill mastered, every rung of its ladder climbed
Climbing now
Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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