Approximate first. Use informal pencil and paper methods to support, record or explain multiplications and divisions. Extend written methods to short division of HTU by U.
Develop calculator skills and use a calculator effectively.
Check with the inverse operation when using a calculator.
Estimate by approximating (round to nearest 10 or 100), then check result.
Use all four operations to solve simple word problems involving numbers and quantities based on money.
Choose and use appropriate number operations to solve problems, and appropriate ways of calculating: mental, mental with jottings, written methods, calculator.