Casual Games

Split Second - Flash Sum

Five numbers flash by. What do they add up to?

Five numbers flash on screen one at a time. Add them in your head before they vanish, then enter the total. An exact answer scores 100, and you still score for getting close. Choose 1-, 2- or 3-digit numbers.

Play now →

No install, no sign-up — starts right away

At a glance

Players: 1 (take turns to compare scores)
Ages: 7+ (Easy)
Play time: About 1 min per game
Levels · Modes: 3 levels (Easy 1-digit, Normal 2-digit, Hard 3-digit; each number is shown for less time each round)

How to play

Choose Easy (1-digit), Normal (2-digit) or Hard (3-digit).
After 3, 2, 1, five numbers appear and disappear one by one. The five dots show which number you are on.
When all five have passed, type the total on the keypad and tap OK.
The sum and the answer are revealed. Play 3 rounds; your score is the average accuracy.

Tips

Add each number as it appears and keep just one running total in mind.
For bigger numbers, add the tens or hundreds first: 47+38 is 40+30=70 and 7+8=15, so 85.
Numbers flash faster each round. Even a close guess scores, so always enter an answer.

What it practices

Mental mathAdd quickly in your head.

Working memoryHold a running total while adding new numbers.

FocusCatch every number as it flashes by.

Great for

Number lovers of all ages
Anyone who wants a quick brain warm-up
Families and friends who want to take turns and compare scores

Good to know

Your score depends on how far off you are as a share of the answer; missing by half or more scores 0. That means being a few dozen off on 3-digit sums can still score well. The numbers are new every game.

Split Second - Flash Sum · Play now →