Mystery Number
This maths warm-up turns a few number clues into a full-on maths detective mission. The best bit? You can make it as easy or as tricky as you like!
How It Works
Think of a number, give your students a series of clues, and let them figure out the mystery. The trick is to reveal the clues one at a time so students can narrow down the possibilities as they go.
Pop these clues on the board and see if your class can crack the code:
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I am a 3-digit number between 300 and 400.
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I am an even number.
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My digits add up to 15.
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My tens digit is double my ones digit.
After each clue, ask, "What could the number be now?" Encourage students to share their guesses and explain their reasoning as the possibilities get smaller.
The answer is 384, but don't give it away too soon!
Want to keep the fun going? Challenge students to create their own mystery numbers and write clues for a partner to solve. It's a great way to get them thinking about number properties from a different perspective.
Why It's So Good
• Builds number sense and logical reasoning.
• Encourages students to use clues to eliminate possibilities.
• Sparks mathematical discussions and encourages students to explain their thinking.
• Easy to differentiate by changing the number of digits or the complexity of the clues.
• Quick to set up and easy to repeat with new numbers.
Next time you're looking for a quick maths warm-up, give Mystery Number a go! Start with a few simple clues, let the guesses roll in, and see who can crack the code. You might even have your students asking to be the ones to create the next mystery!
