IGCSE / O LEVELS MATH LESSON PLAN 1.8 – Standard Form

Section	Details
Objective	Understand and use the standard form A×10nA × 10^n where 1⩽A<101 ⩽ A < 10 and nn is an integer.
Activities	– Starter (5 mins): Show a very large number (e.g., 5,600,000) and a very small number (e.g., 0.000042). Ask students how they might write them more simply. – Main (30 mins): Teach definition of standard form; practice converting numbers into and out of standard form. Include positive and negative powers of 10. – Plenary (5 mins): Quick quiz – teacher gives numbers and students rewrite in standard form.
Resources	Worksheets, calculator, PowerPoint with examples.
Time	40 minutes: 5 (Starter) + 30 (Main) + 5 (Plenary).
Homework	Convert 20 given numbers into standard form and back.
Assessment	Worksheet: rewriting large/small numbers in standard form.
Past Paper Practice	“Write 0.00053 in standard form.”

Section	Details
Objective	Perform calculations with numbers in standard form (multiplication, division, addition, subtraction).
Activities	– Starter (5 mins): Recap converting numbers into standard form. – Main (30 mins): Teach rules for multiplying/dividing standard form numbers (adjusting powers of 10). Practice addition/subtraction by aligning powers of 10. Work through mixed examples. – Plenary (5 mins): “Speed test” – students solve 5 calculation questions in standard form.
Resources	Worksheets, calculator, worked examples on board.
Time	40 minutes: 5 (Starter) + 30 (Main) + 5 (Plenary).
Homework	Solve 15 calculation problems involving multiplication, division, addition, and subtraction in standard form.
Assessment	Worksheet: calculations in standard form.
Past Paper Practice	“Evaluate (3.6×105)×(2×10−3)(3.6 × 10^5) × (2 × 10^{-3}).”