Combine the 6 numbers using +, β, Γ, Γ· to reach the target as closely as possible. You have 45 seconds.
Based on the famous "Numbers Game" round from the long-running British TV show Countdown (running since 1982), this puzzle tests your ability to combine arithmetic operations creatively under time pressure. You're given six numbers - a mix of small (1-10) and large (25, 50, 75, 100) - and must reach a randomly generated three-digit target using addition, subtraction, multiplication, and division, using each number at most once.
What makes this genuinely hard is the sheer size of the combinatorial search space - with six numbers and four operations, there are thousands of possible expressions, and the fastest solvers don't brute-force search them all, they recognize useful intermediate patterns (like multiplying two numbers to get close to the target, then adjusting with addition or subtraction). If you've watched Countdown and wanted to try the numbers round yourself, this free online version generates unlimited puzzles.
Countdown has aired continuously on British television since 1982, making it one of the longest-running game shows in TV history, and the Numbers Game round has become a beloved mental arithmetic challenge in its own right, inspiring countless spin-off apps and puzzle books outside the show itself.
Multiplying two large numbers together often gets you close to a 3-digit target fast, then adjust with small numbers.
Ask "what two numbers could combine to get close to this?" rather than randomly trying operations forward.
Division is underused but can shrink a large number into a useful intermediate value for this numbers game.
Fans of the Countdown TV show, mental math enthusiasts, competitive puzzle players, and students practicing quick arithmetic combinations all enjoy this free numbers game as a satisfying alternative to standard math quizzes.
This puzzle format is based on the "Numbers Round" from the long-running British television show Countdown, which first aired in 1982 and is still broadcast today, making it one of the longest-running game shows in the world. Contestants are given six numbers - a mix of large numbers (25, 50, 75, 100) and small numbers (1 through 10) - and must combine some or all of them using addition, subtraction, multiplication, and division to reach a three-digit target number, all within a strict time limit.
What makes the puzzle genuinely difficult is that there is rarely an obvious first step. Unlike straightforward arithmetic, you often need to work backward from the target, testing several intermediate results before finding a combination that resolves cleanly, which is why skilled players train themselves to instantly recognise useful factor pairs and multiples on sight.
A common and effective approach is to first check whether the target can be reached using just two of the large numbers with a single operation - this covers a surprising number of puzzles instantly. If not, try combining one large number with several small numbers to close the remaining gap, since addition and subtraction chains with small numbers are usually faster to compute mentally than multiplication chains with large ones. Keeping a mental note of perfect squares and common multiplication tables well beyond the usual 12x12 range noticeably speeds up recognition of useful combinations.
If you enjoy the arithmetic-under-pressure format, Grid Calculation Challenge asks you to scan a grid for two numbers summing to a target instead of combining six numbers, and Quick Math Quiz offers a straightforward ten-question timed arithmetic test if you want a shorter, more direct benchmark of raw calculation speed.
No - each of the six numbers can only be used once, exactly like the original TV show rules. You also don't have to use all six.
On the original show, being within 5 of the target earns partial points - the exact target is always the goal, but a close answer still shows solid number sense.
Yes, completely free with unlimited new puzzles generated instantly, no signup needed.
It's based on the numbers round from the British TV show Countdown, where you use six given numbers and basic arithmetic to reach a random three-digit target.
Only addition, subtraction, multiplication, and division are allowed, and you don't have to use every number provided.
Not always β sometimes the closest possible answer is a few points off the target, and getting within 10 still counts as a strong result.
It forces rapid mental arithmetic under time pressure while exploring multiple operation combinations, strengthening numerical flexibility and working memory.