Mathematical Fun: Magic or Mathematics Ninety Nine
Number trick explained with algebra: the class picks a number between 50 and 100, adds a chosen amount, moves the hundreds digit and subtracts, landing on a predicted result; students then work through why it always works.
- Grades
- Grades 7–10, Middle School, High School
- File type
- Preparation
- Print ready
- Topic
- numbers worksheet, math fun
- Resource types
- Worksheets & Printables, Worksheets
- Preparation
- Print ready
About this resource
What's inside this resource
Magic or Mathematics Ninety Nine is a 1-page printable to explore the magic of math. Students will work with numbers and algebraic equations within this exercise.
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In the classroom
Teaching tips & learning objectives
Learning objectives
- Represent the steps of a number trick with variables
- Explain algebraically why the trick always produces the predicted result
Skills covered
- Algebraic modeling — rewriting each step of the trick as an expression in x and y
- Place value reasoning — tracking what happens when the hundreds digit is moved
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Resource details
Concepts & topics
Core concepts
Core concepts
- Variables
- Algebraic expressions
- Place value
- Number tricks
Topics
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