Mental Math Free online game

What is it?

Mental Math is a brain game: for 60 seconds, solve the arithmetic problems on screen in your head and pick the right answer from four choices. Problems get a little harder the more you get right.

Answer correctly in a row for bonus points; a wrong answer takes 3 seconds off the clock. Because it tests speed and accuracy together, it's a great way to sharpen your focus in a short time.

How to play

1. Tap the right answer out of four
2. Answer correctly in a row for bonus points
3. A wrong answer costs 3 seconds. Problems get harder as you go

Playing on PC (keyboard · mouse)

On phones you tap the screen; on PC you can also use the mouse and the keys below.

Difficulty and rankings

There's a weekly ranking and an all-time ranking; the weekly one resets every Monday at midnight (Korea time). For details, see the Help.

Good to know on Hanpanmadang

• A correct answer starts at 10 points and rises by 2 with each answer in a row, reaching 30 points per problem from the 11th consecutive correct answer.
• A wrong answer costs 3 seconds and resets your streak.

Common mistakes

Guessing without working out the answer to save time.

A miss costs 3 seconds and your streak bonus. Spending one more second per problem pays off.

Getting stuck on a hard problem.

Work out just the last digit first to narrow the choices. Often only one of the four answers has the right last digit.

Tips

• For addition and subtraction, split around 10. Think of 8 + 7 as 8 + 2 + 5, and 15 − 8 as 15 − 5 − 3.
• A miss costs 3 seconds, so when unsure, thinking one more second beats guessing.
• Recall your times tables for multiplication, and pairs that make 10 (3 and 7, 4 and 6) for addition.
• The streak bonus is big, so start calmly and don't slip up on the easy early problems.