Stop grading.
We do the explaining.

Each day is one session — 15 problems, 20 minutes, then done. The same structure every day means less convincing, less negotiation, and a finish line your child can see from Day 1. 80 days, 80 sessions, one clear goal.

The opposite. Your child solves on paper with a pencil — no phone in hand during the 20-minute session. The app comes out only after solving, for about two minutes, to enter answers and see the score. That order matters: a 2025 neuroscience review (MDPI Life) reports that handwriting activates a broader network of brain regions — motor, sensory, and cognitive — while typing engages fewer neural circuits and more passive engagement. So the pencil does the learning, and the screen only does the scoring. Your child keeps the focus benefits of paper practice and still gets the instant feedback of an app, without trading one for the other. No games, no videos, no infinite feed — the app has exactly one job, and it's done in about two minutes.

No. Instant scoring, 20-minute timer, parent dashboard, topic heatmaps, and step-by-step explanations — all included free with every workbook. One-time purchase. No subscription, ever.

IXL is screen-heavy and typically runs $79–$159 a year, every year — and even IXL's own paper workbook can't score itself; the scoring lives in the subscription. Khan Academy is free but 100% screen. Kumon uses paper like we do, but it's a monthly tuition, and you still wait for scoring. 15Q20M sits in the gap: a paper workbook with instant digital scoring — $14.99 once, no subscription. The deeper difference is scope. Digital platforms offer open-ended drills and giant mastery trees, which sounds generous but leaves kids unsure when they're done — so many quit before finishing. 15Q20M is fixed: 15 problems, 20 minutes, 80 days, with a finish line your child can see from Day 1. And unlike scoring systems that reviewers frequently report can tank a score over a single mistake, 15Q20M never drops a score for a wrong answer. Fifteen problems, then it's done.

They get a step-by-step explanation right in the app, then a free practice twin — a new problem testing the same skill — so they can try again before moving on. 1,200 twins per grade, included with every workbook. Never an upsell.

No — and that’s by design. 15Q20M builds fluency on concepts your child has already learned at school. When your child gets an answer wrong, the app shows a step-by-step explanation. You never need to teach.

You don’t need to teach anything. Your child solves independently on paper, the app grades instantly, and wrong answers get step-by-step explanations. You just check the dashboard.

No app download for kids. They scan the QR on the page, the timer starts, and they enter answers — about two minutes, and they're done.

Pick the grade your child is in at school — each book follows that grade's Common Core standards day by day. If your child is catching up, start one grade lower and move up when the daily scores stay above 80%. If they are ahead, the Master zone at the end of each day is where the stretch lives.

Yes. A four-page Quick Answer Key is bound into the back of the book, so you can check on paper whenever you prefer. The app adds what a key cannot: instant scoring, a topic breakdown, a step-by-step explanation for every miss, and a practice twin to try again.

Any phone or tablet with a camera and a browser. Scan the QR on the page and the day opens in the browser — nothing to install, no account for your child. A parent account lets you see the dashboard from any device.

Every day climbs through 5 zones, from a warm-up your child can finish to a Master question that stretches them, so one book fits a wide range without being all easy or all hard. If a topic is off, the app shows exactly where, and the free practice twins give a second try before moving on.