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Grade 5 · Fractions

Food-science laboratory: count fractional portions in whole units

At a food-science activity, 4 whole units of a material are portioned into pieces of size 1/4. Change the controls and explain what the animation reveals.

Predict what will happen, press Play, then pause and explain what changed. Every control also works without playback.

Watch the relationship

Paused
Food-science laboratory: count fractional portions in whole units. Whole units: 4. Portions counted now: 0. Final portions: 164 ÷ (1/4) = 16Every outlined whole has the same size.
All whole units are identical, and the material may be partitioned exactly into the stated unit fractions. There is no cutting loss or leftover material.

Starts paused. Play once, pause anywhere, or use Step to inspect the mathematics. Playback stops when this panel leaves the screen.

Make it your experiment

Change one value. Notice what follows.

The controls adjust the model. Numbers below describe the current frame. Decimals are rounded.

Whole units
4
Portions counted now
0
Final portions
16

HD animation studio

From experiment to screen.

Present a crisp Canvas scene, save a full-HD image, or capture your model as a silent video.

Understand what you are seeing

The idea behind the motion.

At a food-science activity, 4 whole units of a material are portioned into pieces of size 1/4. Division by a unit fraction asks how many small portions fit in the available whole amount. Each whole contains the denominator's number of portions, so smaller portions produce a larger count. 16 portions fit exactly. Multiplying that count by 1/4 reconstructs the original 4 units.

A relationship to keep

4 ÷ (1/4) = 16

Read the symbols alongside the explanation. A diagram shows the relationship; the assumptions tell you when it applies.

  1. STEP 1

    Read the starting situation

    At a food-science activity, 4 whole units of a material are portioned into pieces of size 1/4. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Count the equal portions across every whole strip. A new strip repeats the same fractional unit rather than defining a larger whole. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    16 portions fit exactly. Multiplying that count by 1/4 reconstructs the original 4 units. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

Food-science laboratory: use the original situation. At a food-science activity, 4 whole units of a material are portioned into pieces of size 1/4. How many such portions would fit in one additional whole unit?

Use the values specified in the question. Reset restores the initial values for this investigation.

Compare your explanation

20 portions in total, 4 more than before.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 5 · Algebra

Count fractional portions in a whole

Interpret whole-number division by a unit fraction.