Unit 1 - Formulae

1.1 - Substitute into worded formulae

1.2 - Substitute integers into formulae

1.3 - Substitute negatives into formulae

1.4 - Substitute decimals and fractions into formulae

1.5 - Writing a formula

1.6 - Changing the subject with 4 operations

1.7 - Changing the subject with indices

1.8 - Changing the subject with factorising