🔢 Mathematics · Addition & Subtraction
Addition and subtraction within 1000
Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds
Typical age: 7–8 years
“Can your child add or subtract numbers in the hundreds — like '347 + 256' — by thinking about hundreds, tens, and ones separately, or drawing a diagram to help?”
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- Fluent adding and subtracting within 1000REQUIRED
Fluency within 1000 builds on strategy-based adding/subtracting within 1000
- Estimating by rounding
Estimating and checking applies to three-digit calculations
- Adding and subtracting (age 7+)REQUIRED
Formal columnar methods build on conceptual understanding of composing/decomposing