Grade 4 · Multiplication
Habitat restoration: multiply every expanded place-value part
At a habitat restoration project, 2 identical supply sets each contain 123 plant plugs. 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
PausedHD 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 habitat restoration project, 2 identical supply sets each contain 123 plant plugs. Distributivity lets a multi-digit factor be split into hundreds, tens, and ones. Every part occurs in every set, so every place-value part must be multiplied by the same copy count. 100 × 2, 20 × 2, and 3 × 2 account for all 246 objects.
A relationship to keep
123 × 2 = 246
Read the symbols alongside the explanation. A diagram shows the relationship; the assumptions tell you when it applies.
- STEP 1
Read the starting situation
At a habitat restoration project, 2 identical supply sets each contain 123 plant plugs. Identify what each number measures before changing a control; the worked example refers to these starting values.
- STEP 2
Follow the mathematical change
Reveal the hundreds, tens, and ones products separately. Recombine those nonoverlapping contributions to recover the total. Pause on an intermediate frame and compare the picture with the live readouts.
- STEP 3
Explain and test the relationship
100 × 2, 20 × 2, and 3 × 2 account for all 246 objects. Change one input, predict its effect, and test whether the same relationship still works.
Your turn to explain
Make a prediction. Test your reasoning.
Habitat restoration: use the original situation. At a habitat restoration project, 2 identical supply sets each contain 123 plant plugs. How many objects would one additional identical set contribute, and what would the new total be?
Use the values specified in the question. Reset restores the initial values for this investigation.
Compare your explanation
It contributes 123; the new total is 369. A new copy repeats all the place-value parts.
Work through a full lesson
Connect the animation to a worked example and practice questions.