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Grade 1 · Addition

Toy-shop cars: see ten and the extra part

A display at a pretend toy shop begins with 5 counters and has 6 more ready to join. 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
Toy-shop cars: see ten and the extra part. Starting amount: 5. Joined so far: 0. Current total: 55 + 0 = 5Each outlined frame has exactly ten places.
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.

Starting amount
5
Joined so far
0
Current total
5

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.

A display at a pretend toy shop begins with 5 counters and has 6 more ready to join. A ten-frame has ten positions. First identify the empty positions needed to finish ten; any arriving counters beyond those positions belong in a second frame. 5 counters complete the original ten-frame. Compare that missing part with the 6 counters available to add.

A relationship to keep

5 + 6 = 11; missing part of ten = 5

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

    A display at a pretend toy shop begins with 5 counters and has 6 more ready to join. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Fill the first frame from left to right, then watch any extra counters enter the next frame. Each position holds one counter. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    5 counters complete the original ten-frame. Compare that missing part with the 6 counters available to add. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

Toy-shop cars: use the original situation. A display at a pretend toy shop begins with 5 counters and has 6 more ready to join. Before any arrivals, how many counters are needed to make exactly ten?

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

Compare your explanation

5, because 5 + 5 = 10. This asks about the original frame, not the full supply.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 1 · Algebra

Find the missing part of ten

Compose ten from two smaller groups.