Lesson on standard form, starts by looking at changing from an ordinary number to standard form (and vice versa) also looks at negative powers. Then moves on to calculations involving standard form.
Lesson presentation, that tackles the introduction of this topic through a discovery task.
There are plenty of examples and questions based on every aspect of solving simultaneous equations.
Used with a variety of classes in KS3 and KS4. looks at simple addition before moving on to addition of mixed number fractions with different denominators
Looks at solving basic one/two step equations before going into brackets and fractional equations. Finishes by looking at equations with unknowns on both sides.