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Middle-school physics · Lab demo
Refraction of Light
- How incidence and refraction angles relate
- Light bends when it enters water
- Classroom lab: laser pointer + beaker
Public Gallery
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Official Math Labs
Interactive practice — free for everyone, no sign-in or points
Grade 1 · Addition
Adding with 8, 7, and 6
Make-ten practice for adding onto 8, 7, and 6.
Grade 1 · Addition
Adding with 9
A make-ten adventure for adding onto 9.
Grade 1 · Addition
Make-Ten Helper
Step-by-step make-ten tool for classroom demos.
Grade 1 · Counting
How Many In Between?
Three ways to count how many people stand between two others.
Grade 1 · Place value
Numbers 11–20
Tens and ones with sticks and a place-value counter.
Grade 1 · Number order
Order and Size: 0–20
Ordering, neighbors, number-line comparison, and matching.
Grade 2 · Multiplication
Math Artillery Academy
Aim shells on a number line to see what multiplication means.
Grade 2 · Times tables
Multiplication Bubble Blast
Shoot number bubbles and clear multiplication triplets.
Grade 4 · Division
Long Division Lab
Leveled practice: fact families, long division, and decimals.