100 guided animations · 10 topic units · Free to explore
Make a prediction, change a value, and explain the result. Work through each unit in order or choose the topic you want to understand today. Every investigation has controls, a worked explanation, and a question to test your reasoning.
Your collection at a glance
Scale one digit through powers of ten
Investigations 1–10
Multiply every expanded place-value part
Investigations 11–20
Test divisibility by making full groups
Investigations 21–30
Explain equivalent fraction names
Investigations 31–40
Add eighths and regroup whole units
Investigations 41–50
Repeat a fractional amount
Investigations 51–60
Keep cents aligned when adding money
Investigations 61–70
Combine metres with extra centimetres
Investigations 71–80
Reflect a design across a vertical line
Investigations 81–90
Check area against two side lengths
Investigations 91–100
Related investigations use the same mathematical model with different questions and starting values. Reset restores the values used in that investigation’s worked answer. Read its assumptions before applying a model to a new situation.
100 animations · Showing 1–20
Grade 4 · Place value
Scale one digit through powers of ten · Investigation 1 of 100
A place-value demonstration for a habitat restoration project moves the digit 1 through 1 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 2 of 100
A place-value demonstration for a book drive moves the digit 2 through 1 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 3 of 100
A place-value demonstration for a robotics club moves the digit 3 through 1 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 4 of 100
A place-value demonstration for a food-bank packing station moves the digit 4 through 2 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 5 of 100
A place-value demonstration for a community stadium moves the digit 5 through 2 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 6 of 100
A place-value demonstration for a textile workshop moves the digit 6 through 2 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 7 of 100
A place-value demonstration for a science exhibition moves the digit 7 through 3 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 8 of 100
A place-value demonstration for a school newspaper room moves the digit 8 through 3 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 9 of 100
A place-value demonstration for a trail-map workshop moves the digit 9 through 3 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Place value
Scale one digit through powers of ten · Investigation 10 of 100
A place-value demonstration for a community kitchen moves the digit 1 through 4 places to the left of ones. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 11 of 100
At a habitat restoration project, 2 identical supply sets each contain 123 plant plugs. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 12 of 100
At a book drive, 3 identical supply sets each contain 199 donated books. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 13 of 100
At a robotics club, 4 identical supply sets each contain 275 connector pieces. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 14 of 100
At a food-bank packing station, 5 identical supply sets each contain 351 food packets. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 15 of 100
At a community stadium, 6 identical supply sets each contain 427 seat labels. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 16 of 100
At a textile workshop, 7 identical supply sets each contain 503 fabric pieces. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 17 of 100
At a science exhibition, 8 identical supply sets each contain 579 display tokens. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 18 of 100
At a school newspaper room, 9 identical supply sets each contain 655 printed copies. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 19 of 100
At a trail-map workshop, 2 identical supply sets each contain 731 map symbols. Change the controls and explain what the animation reveals.
Explore animationGrade 4 · Multiplication
Multiply every expanded place-value part · Investigation 20 of 100
At a community kitchen, 3 identical supply sets each contain 807 portion markers. Change the controls and explain what the animation reveals.
Explore animation