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1st Grade Math
14. 1.NBT.C.6
14.2 Subtracting by 10s
Subtracting by 10s
Discover how to subtract by 10s quickly using place value patterns and number lines, with worked examples for subtracting multiples of ten.
What You'll Learn
Recognize that subtracting a multiple of \(10\) changes only the tens digit, leaving the ones digit the same.
Apply the shortcut \(70 - 30 = 40\) by subtracting the tens digits directly and keeping the ones digit fixed.
Use a number line to count back by tens from any two digit starting number.
Compare place value tables to see why the ones column never changes when subtracting tens.
Solve multi step problems like \(90 - 10 - 10 - 10\) by repeating the same tens pattern.
Check an answer by adding the difference back to the number that was subtracted.
What You'll Practice
1
Subtracting 10 from two-digit numbers
2
Using visual tens blocks to model subtraction by 10
3
Solving equations that involve removing one group of ten
Why This Matters
Subtracting by tens builds your understanding of place value and mental math strategies you'll use every day. This foundational skill makes it easier to handle money, tell time, and solve more complex subtraction problems as you advance in math.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Subtraction
Place Value
Tens
Mental Math
Number Sense
OH Curriculum Aligned