Same challenge for everyone
Each current challenge uses the same accumulated chain, so every score is comparable inside the same window.
Practice
00:47
Calculation 3/7
Solve
56 + 24
Your answer
Daily shared challenge
Numday
A 90-second mental math sprint. Everyone gets the same chain of 7 calculations, then compares speed, accuracy, and rank.
No account needed to try the challenge. Sign in only when you want to publish your score, enter rankings, or keep playing after the guest limit.
7calculations
90seconds
1Global ranking
Play first
One short ritual, built for daily competition.
Open the app, start the current challenge, solve the chain, and see your score before any registration step. The ranking unlocks after you finish.
Fast math, no filler
Every correct answer becomes the next starting value. The prompt shows the full operation, like 56 + 24.
Score after the sprint
Speed matters most, mistakes add a small penalty, and tied scores favor the player who completed earlier.
Private leagues
Turn the daily challenge into a friend group rivalry.
Create a private league, share an invite code, and compare the same daily challenge in a closed leaderboard. Leagues keep the main game simple: everyone plays Numday first, then friends see who was fastest.
Download on Android
Invite code
NUM-742A
- Global challenge#128
- League members8/25
- Your rank#2
Practice and return
Practice anytime. Compete once per challenge.
Practice mode teaches the same accumulated math mechanic without consuming the current challenge attempt or guest quota. Daily reminders help you come back only if you have not played yet.
Replayable practice
Warm up with a new non-competitive chain whenever you want.
Result worth sharing
After the challenge, share your score and invite others to beat it.
Back tomorrow
One scored start per window keeps the leaderboard fair and makes the next challenge matter.
Explore Numday
Daily math challenges for fast mental arithmetic.
Numday is built for people searching for a focused daily math challenge, a quick mental math game, or an Android app for competitive calculation practice.
Daily math challenge
Learn how the 90-second shared challenge works, why everyone receives the same 7 calculations, and when rankings unlock.
Mental math game
See how Numday turns mental arithmetic into a short daily game with practice mode, global rankings, and private leagues.
Reto diario matemático
Open the Spanish guide for players searching for a daily math challenge or mental calculation game in Spanish.
Numday is now available on Google Play.
Install Numday on Android and start today's 90-second mental math challenge. Try the challenge before creating an account, then publish your score when you want to compete.
Get Numday on Google Play