Grades 4–5
Logic Grid: After-School Clubs
Two 4 by 4 logic grids with five clues and three clues. Kids cross out, then reason out the rest.
Classroom activity · Logic puzzles and brain teasers
Mystery Number Riddles
Eight “Who am I?” number riddles about digits, odd and even, multiples and square numbers.
- Grade level
- Grades 3–5
- Time
- About 20 minutes
- Answer key
- Yes, page 2 of the PDF
- Kids practice
- Logical reasoning, Problem solving, Persistence, Explaining thinking
What kids do
“Read each clue. Use the hundred chart in your head (or on paper) to find the mystery number.”
Printed on the sheet:
- I am a two-digit number. My tens digit is 4. My ones digit is 2 more than my tens digit.
- I am between 20 and 30. I am even. My digits add up to 10.
- I am a two-digit number less than 50. I am a multiple of 9. My tens digit is
- I am a two-digit odd number. My tens digit is double my ones digit. I am more than 50.
- I am a three-digit number. My hundreds digit is 7, my tens digit is 0, and my ones digit is the number of sides on a triangle.
- I am a multiple of 5 between 60 and 80. My digits add up to 12.
- You say me when you count by 10s. I am more than 80 and less than 100.
- I am a two-digit number made by multiplying a number by itself. My digits add up to 13.
Teacher tip
Have kids list all possible numbers, then cross them out one clue at a time.
How to use it
- Model the first puzzle out loud, thinking through each clue.
- Give pencils with erasers. Logic puzzles need lots of fixing.
- Slide it into a sheet protector so kids can play again with a dry-erase marker.
Watch for
Kids who guess instead of reasoning. Ask them to explain each answer.
Talk about it
- Which clue helped you the most?
- What strategy did you use?
Take it further
Have kids write their own puzzle for a classmate.
US Letter, prints well in black and white. Free for home and classroom use: print as many copies as you need.
More logic puzzles and brain teasers
Grades 2–3
Shape Sudoku Puzzles
Sudoku with shapes instead of numbers: four 4 by 4 puzzles that each have exactly one answer.
Grades 2–3
Odd One Out Brain Teasers
Eight rows of four: circle the one that does not belong and explain why. Words, numbers and shapes.
Grades 3–4
Logic Grid: The Pet Show
A 3 by 3 and a 4 by 4 logic grid about a pet show: who brought which pet, and which pet won which prize.
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