Public learning track
Three-Digit Subtraction: Models, Place Value, and Regrouping Within 1,000
2nd Grade · Math · Open Global Math
11 lessons
Goal
Subtract two- and three-digit numbers within 1,000 using base-ten models, open number lines, expanded decomposition, and standard vertical algorithms with single, double, and across-zero regrouping.
Featured Diagrams
Subtracting Multiples of 100 from Three-Digit Numbers
11 lessons
0 of 11 done
- 1Subtracting Multiples of 100 from Three-Digit NumbersUp nextStart
- 2Subtracting Multiples of Ten from a Three-Digit NumberPremiumNot started yet
- 3Modeling Three-Digit Subtraction with Base-Ten BlocksNot started yet
- 4Using Place Value to Subtract Three-Digit NumbersNot started yet
- 5Subtracting Three-Digit Numbers on Open Number LinesNot started yet
- 6Vertical Subtraction Within 1,000 Without RegroupingNot started yet
- 7Vertical Subtraction Within 1,000: Ungrouping Tens to OnesNot started yet
- 8Vertical Subtraction Within 1,000: Ungrouping Hundreds to TensNot started yet
- 9Vertical Subtraction Within 1,000 with Double RegroupingNot started yet
- 10Subtracting Across Zeros in Three-Digit NumbersNot started yet
- 11Checking Subtraction Using Addition and Inverse LogicNot started yet
Curriculum Framework
2nd Grade · Math · Open Global Math
1
6 lessons
Subitizing, Conceptual Grouping, and Quantity Estimation
Estimate and determine quantities of large collections using perceptual grouping, ten-structures, and benchmark anchors.
2
6 lessons
Ordinal Numbers, Relative Position, and Ranking to 100th
Identify, write, and apply ordinal numbers up to 100th to describe rank, sequential position, and relative order in structured situations.
3
12 lessons
Place Value Structure, Grouping, and Flexible Decomposition to 1,200
Deconstruct and reconstruct two-, three-, and four-digit numbers using standard and non-standard groupings, manipulatives, and place-value logic.
4
8 lessons
Number Representations: Numerals, Words, Expanded Form, and Roman Numerals
Read, write, translate, and model numbers up to 1,000 using standard notation, word names, expanded form, open number lines, and Roman numerals I to XII.
5
10 lessons
Skip-Counting, Multi-Step Sequences, and Numerical Patterns to 1,000
Count forward and backward from any starting number within 1,000 by 2s, 3s, 5s, 10s, 20s, 25s, 50s, and 100s, connecting sequences to money and patterns.
6
10 lessons
Comparing, Ordering, Framing, and Relative Magnitude to 1,200
Compare, order, frame between tens and hundreds, and determine relative distance of numbers up to 1,200 using relational symbols and balance reasoning.
7
8 lessons
Mental Addition and Subtraction Strategies Within 100
Calculate sums and differences within 100 mentally with high fluency using decomposition, making tens, compensation, and number lines.
8
6 lessons
Adding Up to Four Two-Digit Numbers
Add combinations of three and four two-digit numbers using associative grouping, making tens, and columnar algorithms.
9
10 lessons
Three-Digit Addition: Models, Place Value, and Regrouping Within 1,000
Add two- and three-digit numbers within 1,000 using base-ten models, expanded form, partial sums, and standard vertical algorithms with single and double regrouping.
10
11 lessons
Three-Digit Subtraction: Models, Place Value, and Regrouping Within 1,000
Subtract two- and three-digit numbers within 1,000 using base-ten models, open number lines, expanded decomposition, and standard vertical algorithms with single, double, and across-zero regrouping.
11
6 lessons
Multi-Digit Addition and Subtraction: Problem Solving and Applications
Solve single- and multi-step word problems involving addition and subtraction within 1,000, money, estimation, and missing-value equations.