Mathematics·Addition & Subtraction·procedural
Fluent addition and subtraction (age 9+)
Fluently add and subtract whole numbers with more than four digits using the standard columnar algorithm
Suggested ages 9–10
Learning journey
Your child is mastering mental arithmetic with large numbers and using formal written methods for complex calculations, while learning to choose the most efficient method for different types of problems.
Evidence of understanding
- Calculate 34,567 + 28,945 using columnar addition
- Calculate 500,000 − 234,178 using columnar subtraction with multiple exchanges
- Add three five-digit numbers in a single column layout
Assessment prompt
Can Fluent addition and subtraction (age 9+) accurately add or subtract large numbers — like '23,846 + 14,579' — using the column method, carrying and borrowing correctly however many columns it takes?
Standards alignment
No external standards are linked to this topic.