Whole numbers N1/L2.4

Skills, knowledge and understanding		Example
Adults should be taught to:
4 .	evaluate expressions and make substitutions in given formulae in words and symbols to produce results	Calculate the cooking time from a given formula. Calculate areas and volumes from given formulae.
	understand that words and symbols in expressions and formulae represent variable quantities (numbers), not things (i.e. 2a + 2b cannot be explained as 2 apples and 2 bananas)
	understand that the contents of brackets must be worked out first
	understand that, when there is no operator between a number and a variable, or two variables, multiplication is implied, e.g. 2a = 2 x a; ab = a x b; 2ab = 2 x a x b
	understand that, when there is no operator between a number and a bracket, multiplication is implied, e.g. 2 (a + b) = 2 x (a + b)

Sample activities

Match expressions in words and symbols.
Convert expressions from words to symbols, and vice versa.
Evaluate simple expressions using a single variable, two variables, etc.
Evaluate simple formulae using brackets, e.g. perimeter = 2 (l + w).
Use formulae for area and volume.
Use formulae for calculating miles per gallon, speed, etc.
Use simple formulae in spreadsheets.
Discuss simple everyday formulae such as those for cooking joints of meat, making curtains, changing temperature from Fahrenheit to Celsius, changing between metric and imperial units.

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