👋 For parents

A summer math dojo built for real progress.

Number Ninjas is a math dojo for kids in grades 3 to 7. Younger children (grades 3 to 4) follow our new Foundations track; older children take the 5th to 7th grade belt program. A short readiness check places your child at the right level, then a focused, game-like journey takes over. Here's exactly how it works, and how we keep it safe.

What your child achieves

By earning all 10 belts, your child moves from 5th-grade fundamentals to confidently working at a 7th-grade level. They'll master fractions, decimals & percents, ratios & proportions, negative numbers, beginning algebra (expressions & equations), and geometry & data, and gain the confidence to explain and tutor those ideas to younger kids. Ready for more? An advanced track keeps climbing toward 10th-grade algebra and geometry.

New: a Foundations track for grades 3 to 4

Younger children start in Foundations, a 10-belt program that builds the core skills they need: place value, addition and subtraction, times tables, multiplication and division, fractions, decimals and money, and measurement. It uses the same belts, boss battles and rewards as the main program, just pitched at their level, so a grade 3 or 4 child can build real confidence and grow into the 5th to 7th grade journey. You simply choose the grade when you sign up.

A 10-week, 5th to 7th grade journey

Each week tackles one big skill and ends in a “Boss Battle” quiz. Your child must score 80%+ to earn that week's belt and unlock the next, so they can only move forward by truly mastering the material (with unlimited, pressure-free retries).

Four short daily blocks (~your child's pace)

A typical day is bite-sized: a Mental Math warm-up, a Core lesson with practice, a quick Data Log to track their own progress, and a Tutor Track where they practice explaining a concept. An energy meter gently nudges them to stop once the day's work is done. We don't reward over-grinding.

The belt journey

Ten belts, each named for the skill it proves:

1. Factors & Multiples2. Fractions3. Multiply & Divide Fractions4. Decimals & Percents5. Ratios & Rates6. Proportions7. Integers8. Expressions9. Equations10. Geometry & Data

How long does it take?

A normal day in the dojo is about 15 to 25 minutes: four short blocks (a mental-math warm-up, a core lesson with practice, a quick data log, and a one-sentence teach-back). An energy meter gently nudges kids to stop once the day's work is done so it never feels like a grind. Kids who want more can play the optional Endless Dojo and Weekly Tournament for as long as their daily Dojo runs allow.

Reward options you control

You pick how prizes pay out for your child, and you can change it any time in the Parent Hub.

Coins (default) — in-app coins your child spends on avatars and gear. No real money involved unless you opt in.
Cash milestones — real-money prizes you set for mastering belts (a $200 total for the full program is a common range: $15 per belt, plus halfway and capstone bonuses). The app tracks what's been earned; you pay out when it suits you.
Game credits or gift cards (opt-in) — Robux, V-Bucks or App Store gift cards instead of cash. The kid's strongest motivator is often the currency for the game they already love. You still buy and redeem the gift card; the app just tracks what they've earned.

Everything is optional and off by default. The whole program works fine on in-app coins alone.

Beyond the belts: it keeps challenging them

A common worry is "what happens when my child races ahead?" Number Ninjas is built so the learning never runs out, and stays fun for fast and advanced kids.

The Endless Dojo Challenge

Once a child finishes their daily training, they can play the Dojo: a fast, arcade-style challenge where questions get harder and quicker the longer they last (with 3 lives). Difficulty starts near your child's current belt, so it's always a real challenge instead of grinding easy questions. A daily limit keeps it a treat rather than a grind.

Weekly Tournament

A Monday to Sunday race for the best Dojo score. The leaderboard is friends-only (you approve every connection), so kids compete with each other instead of strangers. The top 3 friends each week win a prize that auto-pays the way you've chosen in Reward options (coins, gift card, or cash).

Career pathways: math with a purpose

Kids pick a "future self" (software engineer, scientist, entrepreneur, or game designer) and work through hands-on mini-projects that apply the math they're learning to that career. Fresh randomized problems every replay, so even repeated projects feel new instead of memorized.

Learn it, then teach it

The deepest way to master something is to teach it. After finishing the program your child earns a Certified Tutor badge and can run a real tutoring business with built-in tools: a student tracker, a printable flyer and price list, and a certificate. Teaching younger kids cements their own learning.

Friends & friendly competition (optional)

Your child can connect with friends in two ways, and both end with your approval:

Invite link (best for a brand-new friend): your child shares a link that walks the friend through signing up and the entrance assessment, so they arrive ready. It then creates a connection request for a parent to approve.
Friend code (for a friend who already has an account): your child types in the friend's 6-character code to send a request.

Once you approve with your parent PIN, connected kids can see each other on a friends-only leaderboard, send preset emoji cheers, and challenge each other to timed mental-math duels. It is entirely optional, and there is never any open chat. Exactly how we keep this safe is below.

What you'll see as a parent

The Parent Hub (PIN-gated) is your control panel:

Reward type picker — Coins, Robux, V-Bucks, App Store, or Cash. Change it any time.
Payouts list — every belt earned, every tournament prize, with a "Mark paid" button so you can keep track of what you've actually handed over.
"You owe your ninja" total — running tally of unpaid milestones, only shown when cash rewards are turned on.
Friend approval — every friend request waits on your parent PIN.
Invite link — share Number Ninjas with another family in one tap.

Admin parents (that's you, on your own account) also get an Admin view with all signups, activity, and engagement at a glance.

Built safe for kids

You approve every friend. Friends are added by a private code, and a request is only approved with your parent PIN. Your child can't approve their own.
No open chat, ever. The only way kids interact is preset emoji “cheers” on the leaderboard. There's no free-text messaging anywhere in the app.
Private by default. Your email is never shown to other users, and kids can only see the profiles of friends they're actually connected to, not everyone on the platform.
You stay in control. Remove or block a connection at any time; a blocked user can't send new requests.

How your child joins

Enrolling takes just a few minutes. You create an account and set a private parent PIN, then your child takes a short readiness check, a friendly 10-question quiz matched to their grade. Younger kids get a gentler check for the Foundations track; older kids get the 5th to 7th grade version, so every child starts at the right level.

🔐 You start it with your parent PIN — your permission is always required.
🎯 Score 80% or higher to enroll and unlock Week 1.
🔁 Not quite there yet? They can brush up and retry anytime — no pressure, no limit.

Common questions

Is it really free?+

Yes. The full program (every belt, the Dojo, Tournaments, Pathways, Duels, the Tutor track) is free to play. The only real-money in the experience is the cash or gift-card milestones you choose to set yourself, and that money never goes through us — you hand it to your child directly.

What's the difference between Foundations and the belt program?+

Foundations (grades 3 to 4) builds the core skills: place value, addition and subtraction, times tables, fractions, decimals, money, measurement. The belt program (grade 5 and up) covers 5th to 7th grade math, with an advanced track climbing toward 10th grade. You pick the grade at sign-up; the readiness check confirms the fit.

What if my child fights it or bounces to Roblox?+

Most pull-aways come from boredom or rewards that feel too far away. The Weekly Tournament, friend duels, and randomized Pathway projects exist specifically to add fresh competition each day. If your child loves Roblox, you can also opt them into Robux-gift-card prizes (in Parent Hub) — the strongest motivator is often the currency they already want.

Can I see what my child is actually doing?+

Yes. The Parent Hub (PIN-gated) shows your child's belt, XP, and coin balance, a live activity feedof their recent day completions, boss battles, and Dojo runs, and every reward they've earned with a "Mark paid" button so you can keep the books straight.

What if my child falls behind?+

Days unlock in order and boss battles require 80% to pass, but every retry is free and unlimited. There's a study guide for each belt that they (and you) can revisit any time. Nothing is timed punitively, and the energy meter on the Dojo keeps them from grinding when they're frustrated.

Do you collect data on my child?+

We collect the minimum needed to run the program: a display name, an email for the account, and the training progress (belts, XP, scores). No browsing history, no third-party trackers, no ads, and your email is never shown to other users. Friends are added only by code, and only with your parent PIN.

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Free to play

Number Ninjas is completely free to use. If it's helping your child and you'd like to support it, donations are welcome, and they help us keep it free and unlock extra practice and bonus content for kids. Donations are always optional and never required to use the program.

Ready to start your ninja?

Set up an account in a minute — you'll choose your parent PIN during sign-up.