Mathematics·Addition & Subtraction·procedural
Fluent adding and subtracting within 1000
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and the relationship between addition and subtraction
Suggested ages 8–9
Learning journey
Your child is mastering more complex addition and subtraction — working with larger numbers up to four digits, solving multi-step word problems, and using formal written methods alongside mental strategies.
Evidence of understanding
- Add two three-digit numbers fluently using an efficient method
- Subtract three-digit numbers fluently, including with regrouping
- Choose the most efficient strategy based on the numbers involved
Assessment prompt
Can Fluent adding and subtracting within 1000 add or subtract three-digit numbers like '672 − 348' reliably, choosing whichever method works best for them?
Standards alignment
3.NBT.2US · ccss-math
Fluently add and subtract within 1000
Common Core State Standards for Mathematics · 3