# R9c – Finding percentages and percentage changes multiplicatively using decimals

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Prerequisites

# Estimating percentages of quantities

Before working out precise percentages of quantities, it can be helpful to make estimates so that you can sense-check your eventual answer. For example, you can quickly work out that 26% of 362 must be a little more than 25% or 360 i.e. it must be greater than 90.

# Part 1 – Finding percentages multiplicatively using decimals

Teacher resources for Part 1

• Slides in PPTX (with click-to-reveal answers)
• Slides in PDF (one slide per page, suitable for importing into IWB software)
• Worksheet (with space for student work)
• Handout (slides with exercises only; 4 per page for reduced printing)

#### Unlimited practice questions: Turning a percentage into a decimal multiplier

Unlimited practice questions: Turning a percentage into a decimal multiplier

# Part 2 – Finding percentage changes multiplicatively using decimals

Teacher resources

• Slides in PPTX (with click-to-reveal answers)
• Slides in PDF (one slide per page, suitable for importing into IWB software)
• Worksheet (with space for student work)
• Handout (slides with exercises only; 4 per page for reduced printing)