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Grade 2 · Measurement

Bus-stop counters: repeat equal measuring units

A measuring strip for a transport model is assembled from 10 equal pieces, each 3 cm long. 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
Bus-stop counters: repeat equal measuring units. Units laid down: 0. Length measured now: 0. Final length: 3010 equal pieces × 3 cm = 30 cm0612182430Measured now: 0 cmRepeat the same unit without gaps or overlaps.
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.

Units laid down
0
Length measured now
0
Final length
30

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 measuring strip for a transport model is assembled from 10 equal pieces, each 3 cm long. Measurement repeats a fixed unit end to end. No gaps or overlaps are allowed, and the zero mark must align with the starting endpoint. The 10 pieces span 30 cm; the number of pieces and the number of centimetres differ when a piece is longer than one centimetre.

A relationship to keep

10 × 3 cm = 30 cm

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 measuring strip for a transport model is assembled from 10 equal pieces, each 3 cm long. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Add one measuring piece at a time. Each piece extends the total by the same length, so the endpoint records repeated addition. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    The 10 pieces span 30 cm; the number of pieces and the number of centimetres differ when a piece is longer than one centimetre. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

Bus-stop counters: use the original situation. A measuring strip for a transport model is assembled from 10 equal pieces, each 3 cm long. How long would a strip made from one more identical piece be?

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

Compare your explanation

33 cm. One additional piece contributes 3 cm.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 2 · Geometry

Measure from a ruler's zero mark

Use interval differences when measuring with a ruler.