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1st Grade Math
14. 1.NBT.C.6
14.3 Subtracting with place value models up to 100
Subtracting with Place Value Models up to 100
See how base ten blocks make subtracting two-digit numbers up to 100 easy to picture, including when you need to regroup a ten into ones.
What You'll Learn
Represent a two-digit number as a group of tens blocks and ones blocks before subtracting.
Subtract the ones blocks first, then the tens blocks, matching each digit of the smaller number.
Regroup one tens block into ten ones blocks whenever there are not enough ones to take away.
Cross out the blocks being removed and count what remains to find the difference.
Check the answer by confirming that leftover tens and ones match the written subtraction, such as \( 52 - 27 = 25 \).
What You'll Practice
1
Subtracting two-digit numbers using place value blocks
2
Solving problems that require regrouping with visual models
3
Interpreting block diagrams to find differences up to 100
Why This Matters
Place value models help you truly understand what happens when you subtract, not just memorize steps. This visual foundation makes mental math easier and prepares you for subtracting larger numbers and working with decimals in future grades.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Place Value
Subtraction
Regrouping
Visual Models
Two-Digit Numbers
OH Curriculum Aligned