Columnar Addition and Subtraction

Curriculum

3AS–2: Add and subtract up to three-digit numbers using columnar methods.
This methodical approach strengthens computational skills and accuracy in handling larger numbers.

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Resources

Hugo Cheyneover 1 year ago

https://www.bbc.co.uk/bitesize/topics/zy2mn39/articles/z3kmrwx#z4qpb7h

BBC bitesize video and worksheets introducing column addition.

Hugo Cheyneover 1 year ago

https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-subtracting-with-regrouping-within-1000/v/basic-regrouping-or-borrowing-when-subtracting-three-digit-numbers

Subtracting 3 digit numbers together explained clearly, with follow on exercises.

Hugo Cheyneover 1 year ago

https://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-adding-with-regrouping-within-1000/v/carrying-when-adding-three-digit-numbers

Adding 3 digit numbers together explained clearly, with follow on exercises.

Hugo Cheyneover 1 year ago

https://www.khanacademy.org/math/early-math/cc-early-math-add-sub-100/subtraction-within-100/v/introduction-to-regrouping-borrowing

Introducing column based subtraction with 2 digits - very cleanly explained with follow on exercises.

Hugo Cheyneover 1 year ago

https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/addition-with-regrouping

Video on columnar addition - Sal Khan, as always, is fantastic at explaining core maths ideas in a way that is easy to understand.

Required Topics

Secure Fluency in Addition and Subtraction Crossing Ten

Comprehensive Two-digit Number Calculations

Next Topics

Understanding Additive Relationships

Columnar Addition and Subtraction

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