Curriculum placement
Grade 2. This describes the skill, not a learner estimate.
Regrouping within 1,000
Add and subtract through one thousand using place value
Problem types
- Regroup a three-digit sum
- Exchange to subtract
Builds on
Leads to
- Explaining why a strategy works
- Adding and subtracting within 1,000
- The four operations with decimals · Extend the idea
Regrouping across tens and hundreds is the same move as regrouping when adding or subtracting decimals.
- Positive and negative numbers · See it applied
A running balance adds and subtracts three-digit amounts, and regrouping gives the new balance even when it falls below zero.
Related skills
- Adding, subtracting, and multiplying polynomials · Related idea
Adding with regrouping combines each place separately, as adding polynomials combines each power separately.
- Comparing three-digit numbers · Shared foundations
- Adding or subtracting 10 or 100 mentally · Shared foundations
- Sums and differences on a number line · Shared foundations
- Rounding whole numbers · Shared foundations
Open the interactive map to explore lessons and skill connections.