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Grade 1 · Number sense

Reading-corner books: count a collection once

At a reading corner, 9 books are arranged with up to 2 in each display row. 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
Reading-corner books: count a collection once. Counted now: 0. Still to count: 9. Full collection: 9Counted 0 of 9One counting word for each object.
The quantities are invented for this investigation. Controls change the model rather than real-world records. Displayed decimals are rounded; whole-number counts are exact.

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.

Counted now
0
Still to count
9
Full collection
9

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 reading corner, 9 books are arranged with up to 2 in each display row. Match exactly one counting word to each object. An incomplete row still belongs to the collection, and changing the row length does not change the total. The starting collection has 9 objects regardless of whether a row holds 2 or another allowed count.

A relationship to keep

Counted + not yet counted = total

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 reading corner, 9 books are arranged with up to 2 in each display row. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Move the timeline to color each object once; stop before the end and account for the pale objects too. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    The starting collection has 9 objects regardless of whether a row holds 2 or another allowed count. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

Reading-corner books: use the original situation. At a reading corner, 9 books are arranged with up to 2 in each display row. One more book is added to the original collection. What is the new count?

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

Compare your explanation

9 + 1 = 10 objects. The original objects remain and one new object joins them.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 1 · Algebra

Count every object once

Match one counting word to each object.