# AN N1/L2.4

Evaluate expressions and make substitutions in given formulae in words and symbols to produce results (a) 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) (b) Understand that the contents of brackets must be worked out first (c) 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 (d) 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)

A challenging set of exercises (in real life contexts) for L1-2 algebra. Also ideal for underpinning L2 Functional Maths.

Lots of useful practice in substitution and converting temperatures.

Topical practice with L1-L2 number and measure skills (plus a few at E3) and would make a good starter or homework activity. Most questions are based on recent data from the Big Freeze of January 2010. Topics include converting temperatures, converting between metric and Imperial units, proportion, negative nos. and percentrages.

The topical and problem solving nature also makes this very suitable for underpinning L1 and L2 Functional Maths.

A seasonal introduction to substitution and order of operations.

Lots of practice in substitution and converting temperatures from home and abroad. With comprehensive answer sheet.

A wonderful seasonal L1-2 investigation (2 options – one for L1, one for L2) that covers ratios, formulae (oven temperatures, cake tins), converting measures, money and more.

Also includes a useful information sheet on autumn festivals from different cultures and faiths – ideal for prompting further discussion re. equality and diversity.

A fascinating investigation that shows students how to calculate a body mass index and asks them to investigate the BMI of their choice of celebrities and present the results graphically. Covers formulae, decimals, calculators, converting measures, representing data, averages and range.

Excellent practice with many Level 2 elements including fractions, decimals, percentages, ratio, converting measures, and using formulae.

Very useful and realistic practice – questions cover mobiles, cooking, printing photos, plumbing rates, etc.

A super Level 2 lesson that focuses mostly on conversions (currency, distances and temperature). Includes a ‘distance between two cities’ chart that is useful for other activities. Great for the end of term.