EveryMemoryMissing Operator
Pick the operator (+, -, x or divide) that makes the equation true. A fast, free mental-arithmetic puzzle you play in your browser.
⚡ Quick answer
Missing Operator is a quick mental-arithmetic puzzle where you pick the operator that balances an equation. It is a fun, self-relative challenge you compare only to your own past results. It is not a medical or cognitive test.
Key takeaways
- Free in your browser, no sign-up, pick the operator that balances the equation.
- Each puzzle has exactly one correct operator and clean whole-number results.
- Chase your own best streak across three lives, scores saved on your device.
- A fun self-relative arithmetic challenge, not a medical or cognitive test.
Missing Operator shows you an equation with one symbol hidden, like 6 ? 2 = 12, and asks you to choose the operator that makes it true. Play it above before you read on.
It is free, needs no sign-up, and your best streak is saved on your own device so you can chase your previous record.
How to play
The game gives you two numbers, a result, and a hidden operator. Your job is to spot which of the four operators fits.
- Read the equation, for example 6 ? 2 = 12.
- Tap +, -, x or the divide button.
- A correct pick adds to your streak and serves a new equation.
- A wrong pick costs one of your three lives.
No account is needed and your best streak is stored on your device.
What it trains
This game leans on quick number sense and the ability to test options in your head.
- Mental arithmetic across all four operations.
- Working memory while you hold the numbers.
- Flexible thinking as you rule operators out.
Honestly, you mostly get better at this specific puzzle. It is not an IQ measure.
Tips for a longer streak
A few habits make the operator pop out faster.
- Glance at the result size first: a big result usually means multiplication.
- If the result is smaller than both numbers, think subtraction or division.
- Check divisibility quickly before committing to the divide button.
The honest way to read your score
Your streak only means something next to your own earlier runs, not anyone else's. A tired day is a lower streak, and that is fine.
If you enjoy this kind of number drill, try our number compare game or read about working memory to see what holds the numbers in mind.
⚠ When to talk to a professional
This is a fun puzzle for everyday practice, not a medical or cognitive test, so see a qualified professional for any real concerns about your thinking or memory.
