Puzzles and Riddles
Learning Goals:
- Determine the missing numbers in equations
- Develop and apply reasoning skills to make and test math predictions
- Communicate mathematical thinking orally and visually
The Challenge:
I am a mystery 4-digit number.
Discover what number I am by using the following clues:
- I am an even number.
- I am less than 3000.
- All four of my digits are different.
- My tens digit is half of my ones digit.
- My hundreds digit times my thousands digit is equal to 5.
- My ones digit plus my tens digit is equal to my hundreds digit plus my thousands digit.
- The product of all four of my digits is equal to 40.
- My thousands digit is 4 less than my hundreds digit.
- The sum of all four of my digits is equal to 12.
Can you find the mystery number?
Questions and Prompts to Support your Child:
- Which clue did you start with? Why did you use that one first?
- Which clue narrowed things down the most? Which was the least specific?
Extensions & Adaptations:
- Create a set of clues that will lead someone to a different decimal number. How can you be sure that your clues will lead them to only one possible solution?
Source: Who Am I? Puzzles – Education Development Center
Categories: Elementary