Number 3 summary

Key learning points

• Share in a ratio using total parts.
• Direct $y=kx$; inverse $y=k/x$.
• Standard form $a\times10^n$ with $1\le|a|<10$.
• Estimate with 1 s.f. when useful.

Worked example 1 — Standard form

Write $0.00056$ in standard form.

Working

Move the point four places right.

Worked example 2 — Share in a ratio using total parts

Use this method from the Number 3 sheet: Share in a ratio using total parts.

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 3 — Direct ; inverse

Use this method from the Number 3 sheet: Direct $y=kx$; inverse $y=k/x$.

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 4 — Standard form with

Use this method from the Number 3 sheet: Standard form $a\times10^n$ with $1\le|a|<10$.

Working

Each key learning point matches a question type on the printable worksheet.

Worked example 5 — Estimate with 1 s.f. when useful

Use this method from the Number 3 sheet: Estimate with 1 s.f. when useful.

Working

Each key learning point matches a question type on the printable worksheet.

Scaffolded Learning Sheet and answers (PDFs)

This page is a short, searchable overview for revision and search engines. Use the Scaffolded Learning Sheet first, then the Answers PDF for a full written solution. The printable PDFs remain the main classroom resource.