Sensim Math · Depth
Your kid finished the worksheet in five minutes. Now what?
Depth is where strong students slow down and think — the same topics school is teaching, one level deeper. Multi-step, no formula to copy, built to be reasoned through.
✓ Free to solve · no account neededAligned to the Common Core, standard by standard.
Logic, patterns, invariants — thinking no textbook unit teaches.
Explore Reasoning →The school curriculum, one level deeper — where speed stops being enough.
One ladder, from fluency to competition. The rungs are connected underneath — every problem here knows what it rests on and what it grows into.
The product, in one problem
What a Depth problem feels like
Try it yourself, right here — no signup, and no need to sit your kid down yet. If it makes you pause and think, it will do the same for them.
Where to start
Start from what you already know
One thing you've noticed about your child is enough to find the right problems.
“She's doing fractions at school right now.”
Match what school is teaching
Pick the topic on this week's homework — get the set that runs one level under the surface of it.
“He knows his facts, but word problems fall apart.”
Start from the struggle
Pick what you're seeing at homework time — each pattern maps to a problem family built to work on exactly that.
“We're aiming for the gifted program next year.”
Start from the goal
“Where do kids usually start here?”
Follow the well-worn path
Our picks for Grade 4 — from the first rung to the deepest. (Real usage rankings will replace these as data accumulates.)
Not sure where to start? There's an optional 10-minute check-up.
Five problems, picked to locate a starting point. No score, no ranking, no signup — it ends with a suggestion, not a grade. And you can skip it forever: everything below works without it.
For parents
The math is free. What you pay for is visibility.
Your child never hits a paywall — problems, hints, and every topic stay open. The paid plan is for you: a clear picture of where they stand and what comes next.
Hints that teach, not tell
When your child gets stuck, Depth doesn't show the answer. It offers a ladder — each rung a smaller nudge toward thinking it through themselves.
Depth for Parents
- Mastery map across every skill — solid, shaky, and untouched
- A weekly email: what they worked on, where they slowed down
- Suggested next path, recalculated as they solve
Kids' side stays 100% free — with or without a subscription.
For the explorers
Prefer to browse? The whole catalog is open. →
427 problem types · 4,528 generated practice variants across 46 archetypes — numbers change on every visit, so answers can't be memorized.