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1st Grade Math
14. 1.NBT.C.6
14.4 Subtraction facts up to 100
Subtraction Facts Up to 100
Build subtraction fluency up to 100 using counting back, number lines, and place value strategies for confident two-digit subtraction.
What You'll Learn
Recognize subtraction facts up to 100 as the two-digit number pairs you should be able to solve quickly and correctly
Apply counting back and counting up strategies to find a difference like \( 84 - 30 = 54 \)
Use a number line to jump backward in tens and ones instead of counting one at a time
Break numbers apart by place value so \( 63 - 27 \) becomes subtracting tens and ones separately with regrouping
Check every answer by adding the difference back to the number being subtracted to confirm the fact
What You'll Practice
1
Completing fact families with missing addition or subtraction equations
2
Identifying which equation is missing from a three-equation fact family set
3
Working with numbers up to 100 in related addition and subtraction facts
Why This Matters
Understanding fact families strengthens your mental math skills and helps you see the connection between addition and subtraction. This relationship is essential for solving equations, checking your work, and building number sense that you'll use in everyday situations like budgeting and problem-solving.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Fact Families
Subtraction
Addition
Inverse Operations
Number Relationships
Mental Math
OH Curriculum Aligned