Chapter 3.2
Subtraction Strategies: Elevate Your Mental Math Prowess
Unlock the power of efficient subtraction with our comprehensive guide. Learn three key strategies to simplify calculations, boost confidence, and excel in mental math. Start mastering subtraction today!
What You'll Learn
Apply the friendly number method by rounding one number and adjusting the result
Use the add-to-both strategy to create multiples of 10 for easier subtraction
Subtract by counting on from the smaller number to the larger number
Break apart numbers being subtracted to simplify mental calculations
Recognize when subtracting by 9 using the take-away-10-then-add-1 method
What You'll Practice
1
Subtracting two-digit and three-digit numbers using friendly number adjustments
2
Breaking subtraction into steps with multiples of 10
3
Counting upwards by hundreds, tens, and ones to find differences
4
Applying the subtract-by-9 shortcut in various problems
Why This Matters
Subtraction strategies help you solve problems faster in your head without writing everything out. These mental math techniques make everyday calculations easier, from figuring out change at a store to solving complex problems in higher-level math courses.
This Unit Includes
23 Video lessons
Practice exercises
Learning resources
Skills
Mental Math
Friendly Numbers
Subtraction Strategies
Counting On
Adjusting
Place Value
Number Sense
CA Curriculum Aligned
