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Grade 4 · Measurement

School-newspaper copies: combine metres with extra centimetres

A measurement for a school newspaper room consists of 7 whole metres and 70 extra centimetres. 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
School-newspaper copies: combine metres with extra centimetres. Larger units still bundled: 7. Smaller units represented now: 70. Final smaller-unit total: 7707 × 100 + 70 = 7701 m1 m1 m1 m1 m1 m1 mExtra: 70 cm · Same total: 770 cm1 metre = 100 centimetres exactly.
The exact metric relation is 1 metre = 100 centimetres. Extra units are less than one full larger unit. The diagram is a conversion model, not a life-size ruler or balance.

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.

Larger units still bundled
7
Smaller units represented now
70
Final smaller-unit total
770

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 measurement for a school newspaper room consists of 7 whole metres and 70 extra centimetres. One of the larger units contains 100 of the smaller units. Convert the whole-unit part first, then add the extra part in the same unit; do not add differently sized units as if they were identical. The total is 770 centimetres, or 7.70 metres. Both names refer to the same measurement.

A relationship to keep

7 × 100 + 70 = 770 centimetres

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 measurement for a school newspaper room consists of 7 whole metres and 70 extra centimetres. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Follow the conversion from the larger-unit part to its smaller-unit equivalent, then combine the extra smaller units. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    The total is 770 centimetres, or 7.70 metres. Both names refer to the same measurement. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

School-newspaper copies: use the original situation. A measurement for a school newspaper room consists of 7 whole metres and 70 extra centimetres. What is the measurement entirely in centimetres?

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

Compare your explanation

770 centimetres: 700 from the whole metres, plus 70 extra.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 4 · Geometry

Convert through metric length units

Use a stated conversion chain to express lengths in one unit.