Addition/

Subtraction

Addition and subtraction

Addition and Subtraction using Standard Algorithm

Addition

Addition using Flexible Strategies

4-digit Addition Practice

Estimating when adding multi-digit numbers (video) | Khan AcademyUse estimation to find reasonable solutions to 2- and 3-digit addition problems.

Addition using expanded form

Subtraction

Subtraction using strip diagrams

Subtracting across zeros using happy numbers (compensation)

Estimating when subtracting large numbers (video) | Khan AcademyUse estimation to find reasonable solutions to 2- and 3-digit subtraction problems.

Subtraction using expanded form

Multi-digit subtraction with regrouping twice (video) | Khan AcademySal using regrouping to subtact 9601-8023.

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