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Grade 1 · Place value

Music-room bells: a bundle of ten and loose ones

At a music classroom, bells are represented by 1 ten-bundle and 6 loose ones. 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
Music-room bells: a bundle of ten and loose ones. Hundreds contribution: 0. Tens contribution: 10. Number: 160 + 10 + 6 = 16Hundreds0value 0Tens1value 10Ones6value 6Place names determine the value of each digit.
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.

Hundreds contribution
0
Tens contribution
10
Number
16

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 music classroom, bells are represented by 1 ten-bundle and 6 loose ones. A bundle changes the counting unit: one bundle is worth ten individual objects. Read the tens and ones separately, then combine their values without confusing a digit with its contribution. The 1 in the tens place contributes 10, while the ones contribute 6.

A relationship to keep

10 × 1 + 6 = 16

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 music classroom, bells are represented by 1 ten-bundle and 6 loose ones. Identify what each number measures before changing a control; the worked example refers to these starting values.

  2. STEP 2

    Follow the mathematical change

    Reveal the contribution of each place. The tens part groups ten ones; the loose ones add smaller units to the same total. Pause on an intermediate frame and compare the picture with the live readouts.

  3. STEP 3

    Explain and test the relationship

    The 1 in the tens place contributes 10, while the ones contribute 6. Change one input, predict its effect, and test whether the same relationship still works.

Your turn to explain

Make a prediction. Test your reasoning.

Music-room bells: use the original situation. At a music classroom, bells are represented by 1 ten-bundle and 6 loose ones. How many individual objects are represented altogether?

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

Compare your explanation

16, because 1 group of ten and 6 ones make 10 + 6.

Work through a full lesson

Connect the animation to a worked example and practice questions.

Grade 1 · Algebra

Teen numbers are ten and ones

Build a teen number from one ten and extra ones.