Launching soon on iOS · join the waitlist

Do mental math like a wizard.

Add, multiply, and split the bill in your head — faster than they can pull out a phone.

Step-by-step lessons teach you the tricks
Make math fun again
Stay sharp & slow your brain's aging
Be the smartest person in the room
Swap doomscrolling for learning
Press enter or the arrow — that's it, you're in.
3,400+ future human calculators already waiting
35 × 11 = 385
85² = 7225
15% of 80 = 12
9:41
Chapter 0 · Quick Tricks
Multiply by 11
A 2-minute trick that makes you look like a genius.
Start lesson
Split the digits, add them, drop the sum in the middle.
Multiplying by 11
35×11
3
3 + 5
8
5
=385
Your turn
52 × 11 = ?
5
5 + 2
7
2
572 — exactly right!
You just did that in your head!
Lesson complete!
+120 XP
12-day streak kept!
Chapter 1 · Give & Take
Mental Addition
Add big numbers in your head — left to right, the easy way.
Start lesson
Add the big parts first, then the rest.
Left-to-right addition
58+36
50 + 30=80
8 + 6=14
80 + 14 =94
Your turn
47 + 35 = ?
40 + 30=70
7 + 5=12
82 — nailed it!
Left to right — no carrying!
Two lessons down!
+100 XP
Chapter 1 underway
Section 1 · Chapter 0
Your learning path
Multiply by 11
Mental Addition
START · Squaring ×5
What you'll pull off

Faster than the phone in their pocket

Stand out when the bill lands
While everyone fumbles for their phone, you've already called the tip and split it five ways. Be that person.
Be the sharpest in the room
Run the numbers on the spot — in meetings, negotiations, anywhere. People remember who thinks fast.
The friend everyone asks
Become the one people turn to for quick math — the person who makes being smart look effortless.
A peek inside

Calm, friendly, and a little addictive

Numo greets you, teaches the trick, and celebrates every win — five minutes at a time.

9:41
Section 1 · Chapter 0
Learning path
Multiply by 11
Mental Addition
START · Squaring ×5
9:41
Here's a little magic. Watch this.
Multiplying by 11
Split the digits, add them, drop the sum in the middle.
35×11
3
3 + 5
8
5
=385
My turn →
9:41
12 days
You're on a roll!
Numo's proud. Come back tomorrow to keep it alive.
Claim +50 XP

Become the human calculator

Drop your email and Numo will let you know the moment the app goes live. No spam — just one happy hello.

Press enter or the arrow — that's it, you're in.