🔢 Mathematics · Addition & Subtraction
Addition and subtraction strategies (age 10+)
Add and subtract decimals to hundredths using strategies based on place value, properties of operations, and the relationship between addition and subtraction; relate strategies to written methods and explain reasoning
Typical age: 10–11 years
“Can your child add or subtract decimal amounts like '4.73 + 2.68' or '10.00 − 3.47', lining up the decimal points and working through the columns correctly?”
0 / 3 mastered
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Needs first
- Reading and writing numbers (age 10+)REQUIRED
Adding/subtracting decimals requires reading and comparing decimals to thousandths
- Place Value × 10 and ÷ 10
Place-value understanding of ×10/÷10 supports decimal regrouping
- Fluent addition and subtraction (age 9+)REQUIRED
Decimal addition/subtraction builds on fluent whole-number columnar algorithm