Score: 0
Round 1 · 1:00
Combine the tiles!
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About Countdown Crew

Combine six number tiles with arithmetic to hit the target in this free online mental math game. Partial credit, streak multipliers and constraint rounds train number sense at speed.

Countdown Crew is a mental math game modeled on the legendary numbers round from the TV show Countdown. You get six number tiles, a mix of smalls (1 to 10) and bigs (25, 50, 75, 100), plus one three-digit target. Using +, −, × and ÷ with each tile at most once, you race the clock to land exactly on the target or as close as you can.

Every merge is an arithmetic decision. Chasing an exact hit trains factorization (is 952 hiding near 7 × 136?), estimation (will 75 × 8 overshoot?) and the distributive property (75 × 4 = 3 × 25 × 4 = 300). Because each intermediate result must stay a positive whole number, you are really searching a tree of valid expressions, the same problem computers solve with dynamic programming over subsets. Constraint rounds like NO × or USE EXACTLY 4 TILES reshape that search space and force fresh strategies.

Mental arithmetic fluency is one of the strongest foundations for later math success: it frees working memory for algebra, proof and problem solving. Game-show formats like Countdown have trained UK schoolkids for four decades because they reward flexible number sense over rote procedure. There are always many routes to the same target.

Key Science Concepts

What You'll Learn

Grade Level: Middle School, High School

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How to play

  1. Meet the Tiles Each round deals six number tiles: smalls from 1-10 and bigs like 25, 50, 75, 100.
  2. Merge Two Tiles Tap a tile, tap an operator, then tap a second tile to merge them into one result.
  3. Hit the Target Land exactly on the 3-digit target for an EXACT HIT. Near misses still score partial points.
  4. Stay Whole Every step must stay a positive whole number: subtract smaller from bigger, divide evenly.
  5. Mind the Rules Later rounds add Lawton's constraints: NO ×, NO ÷, USE EXACTLY 4 TILES and more.
  6. Streak & Hint Exact hits build a x2 streak multiplier. Stuck? Tap the Focus gauge for a crew hint.

Frequently asked questions

Is Countdown Crew free to play?
Yes. Countdown Crew is completely free to play in your browser. There is no download, install or account needed.
What grade level is Countdown Crew for?
Countdown Crew is designed for Middle School, High School students and works well as a classroom activity or homework.
Does Countdown Crew work on phones and tablets?
Yes. Countdown Crew runs in any modern browser on desktop computers, Chromebooks, tablets and phones in landscape mode.

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