Calculations

Number operations and the relationships between them
	Understand addition, subtraction, multiplication and division as they apply to whole numbers and decimals; know how to use the laws of arithmetic and inverse operations.
	Know and use the order of operations, including brackets.

Mental methods and rapid recall of number facts
	Consolidate the rapid recall of number facts, including positive integer complements to 100 and multiplication facts to 10 × 10, and quickly derive associated division facts.
	Consolidate and extend mental methods of calculation to include decimals, fractions and percentages, accompanied where appropriate by suitable jottings; solve simple word problems mentally.
	Make and justify estimates and approximations of calculations.

Written methods
	Use standard column procedures to add and subtract whole numbers and decimals with up to two places.
	Multiply and divide three-digit by two-digit whole numbers; extend to multiplying and dividing decimals with one or two places by single-digit whole numbers. For calculations with fractions and percentages, see above.

Calculator methods
	Carry out calculations with more than one step using brackets and the memory; use the square root and sign change keys.
	Enter numbers and interpret the display in different contexts (decimals, percentages, money, metric measures).

Checking results
	Check a result by considering whether it is of the right order of magnitude and by working the problem backwards.

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St Louis			National Curriculum
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