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1st Grade Math
1. 1.OA.A.1
1.4 Subtracting with digits up to 20
Subtracting with Digits up to 20
Learn how to subtract numbers up to 20 confidently using counting back, number lines, and subtraction fact strategies.
What You'll Learn
Recognize what the subtraction sign \( - \) means when taking one quantity away from another.
Apply the counting back strategy to solve problems like \( 17 - 5 = 12 \).
Use a number line to model subtraction by moving left from the starting number.
Recall subtraction facts up to 20 to solve problems quickly without counting every time.
Check answers by adding the difference back to the number subtracted, since \( 12 + 5 = 17 \).
What You'll Practice
1
Solving subtraction problems with numbers from 0 to 20
2
Computing differences with single-digit and teen numbers
3
Practicing mental subtraction strategies
Why This Matters
Subtracting with digits up to 20 is a fundamental skill you'll use every day, from counting change to solving more complex math problems. Mastering these facts builds the foundation for multi-digit subtraction, algebra, and real-world problem solving.
This Unit Includes
Practice exercises
Learning resources
Skills
Subtraction
Basic Operations
Number Sense
Mental Math
Arithmetic Facts
OH Curriculum Aligned