Mathematics·Addition & Subtraction·procedural
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
Suggested ages 10–11
Learning journey
Your child is mastering complex addition and subtraction — solving multi-step problems with large numbers and decimals, and choosing the best strategies to work out challenging calculations.
Evidence of understanding
- Correctly compute 3.45 + 2.78 and explain regrouping across decimal places
- Use a number line or base-ten blocks to model 5.03 − 2.67
- Explain why the standard algorithm works for decimal addition by connecting to place-value understanding
Assessment prompt
Can Addition and subtraction strategies (age 10+) 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?
Standards alignment
No external standards are linked to this topic.