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Grade 1 · Comparison

Toy-shop cars: compare by making pairs

Two groups at a pretend toy shop hold 9 toy cars and 10 toy cars. 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: compare by making pairs. First amount: 9. Second amount: 10. Difference: 19 < 10 · difference 1First: 9Second: 10Compare on the same scale and from the same start.
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.

First amount
9
Second amount
10
Difference
1

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.

Two groups at a pretend toy shop hold 9 toy cars and 10 toy cars. Pair one object from the first group with one from the second. Matched pairs account for an equal part of both groups; the unpaired objects show exactly how much larger one group is. 9 pairs can be formed. The difference is 1, so a difference of zero would mean equal groups.

A relationship to keep

9 < 10; difference = 1

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

    Two groups at a pretend toy shop hold 9 toy cars and 10 toy cars. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Advance the timeline to identify the shared count before examining the objects that cannot be paired. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    9 pairs can be formed. The difference is 1, so a difference of zero would mean equal groups. 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. Two groups at a pretend toy shop hold 9 toy cars and 10 toy cars. How many objects must be added to the smaller original group to make the groups equal?

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

Compare your explanation

1 objects. The smaller count 9 plus this difference equals 10.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 1 · Algebra

Compare groups by matching

Decide which group has more using pairs.