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
Multiply complete equal groups
Investigations 1–10
Count groups of a chosen size
Investigations 11–20
Count equal fractional pieces
Investigations 21–30
Subdivide quarters without changing them
Investigations 31–40
Build area with equal square units
Investigations 41–50
Separate covering from boundary distance
Investigations 51–60
Combine hundreds and regroup the total
Investigations 61–70
Choose the nearer hundred
Investigations 71–80
Cross an hour boundary with minutes
Investigations 81–90
Read totals and differences from bars
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 3 · Multiplication
Multiply complete equal groups · Investigation 1 of 100
A rectangular arrangement for a pear orchard has 1 row with 10 pears in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 2 of 100
A rectangular arrangement for a neighborhood festival has 2 rows with 9 lanterns in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 3 of 100
A rectangular arrangement for a science workshop has 3 rows with 8 sample jars in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 4 of 100
A rectangular arrangement for a café supply room has 4 rows with 7 cups in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 5 of 100
A rectangular arrangement for a small theater has 5 rows with 6 seat tokens in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 6 of 100
A rectangular arrangement for a library event has 6 rows with 5 bookmarks in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 7 of 100
A rectangular arrangement for a day camp has 7 rows with 4 camp tokens in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 8 of 100
A rectangular arrangement for an aquatic center has 8 rows with 3 floats in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 9 of 100
A rectangular arrangement for a model railway has 9 rows with 2 track pieces in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Multiplication
Multiply complete equal groups · Investigation 10 of 100
A rectangular arrangement for a neighborhood art project has 10 rows with 1 mosaic tile in each row. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 11 of 100
At a pear orchard, 21 pears are packed in groups of exactly 2. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 12 of 100
At a neighborhood festival, 28 lanterns are packed in groups of exactly 3. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 13 of 100
At a science workshop, 35 sample jars are packed in groups of exactly 4. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 14 of 100
At a café supply room, 42 cups are packed in groups of exactly 5. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 15 of 100
At a small theater, 49 seat tokens are packed in groups of exactly 6. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 16 of 100
At a library event, 56 bookmarks are packed in groups of exactly 7. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 17 of 100
At a day camp, 63 camp tokens are packed in groups of exactly 8. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 18 of 100
At an aquatic center, 70 floats are packed in groups of exactly 9. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 19 of 100
At a model railway, 77 track pieces are packed in groups of exactly 10. Change the controls and explain what the animation reveals.
Explore animationGrade 3 · Division
Count groups of a chosen size · Investigation 20 of 100
At a neighborhood art project, 84 mosaic tiles are packed in groups of exactly 2. Change the controls and explain what the animation reveals.
Explore animation