Number Gym
Math fluency and number sense product suite at Zearn — first to implement new Common Core standards, used by millions of kids across the US.
Make 10 to Add: 8 + 5 = (8 + 2) + 3
- Frame 1: [● ● ● ● ● | ● ● ● ○ ○] (8 counters placed)
- Student slides 2 counters from 5-tray to complete the 10-frame
- Visual readout: 1 full ten + 3 ones = 13 (conceptual grouping before memorization)
Benchmark Hop: 37 + 25 on the Open Number Line
- Hop 1: 37 ──(+3)──► 40 (land on the friendly decade benchmark)
- Hop 2: 40 ──(+20)─► 60 ──(+2)──► 62
- Misconception check: catches ones-place carry errors visually
Prerequisite Graph · Place Value & Mental Decomposition
- When a student misses 43 − 18, routes back to decade decomposition (43 − 10 − 8)
- Tracks fluency growth across concrete → pictorial → abstract representations
- Empowers K–5 teachers with real-time misconception diagnostics
The core problem wasn’t gamifying arithmetic — it was mapping the new Common Core fluency standards into a progression that made mathematical sense instead of reading like a checklist. As PM at Zearn, I led the creation of proprietary curriculum IP around how the standards built on one another: which concepts were true prerequisites, where common student misconceptions lived, and how to sequence interactive visual models so kids built genuine number sense rather than memorizing procedures.
Number Gym became the first product suite to implement the new standards end to end, reaching millions of elementary students across the US through Zearn’s school and district partnerships.