# apt4Maths: PowerPoint Presentation on Approximations – Decimal Places for GCSE (and Key Stage 3) Mathematics

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This is the 7th PowerPoint Presentation only of the full set of 11 PowerPoint Presentations on Place Value and Approximations for GCSE (and Key Stage 3) Maths. This PowerPoint explains how to approximate to a fixed number of decimal places.

The full set of 11 PowerPoint Presentations on Place Value and Approximations can be purchased from www.apt-initiatives.com

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The full set of 11 PowerPoint Presentations on Place Value and Approximations (130 slides, excluding Title Pages) covers the following place value and approximations based topics:

• 01 Place Value – Integers (10 sides): Reviews place value columns and how to read and write whole numbers.
• 02 Place Value – Decimals (10 slides): Reviews place value columns and how to read and write decimal numbers.
• 03 Order and Compare Numbers (10 slides): Explains techniques for ordering lists of numbers (integers and decimals) and how to compare pairs of values using inequality signs.
• 04 Multiply and Divide by Powers of Ten (16 slides): Explains how to multiply or divide whole numbers and decimals by 10, 100 etc.
• 05 Standard (Index) Form (17 slides): Explains why standard (index) form is used, how to read and write values in standard form, and how calculators are used with this format.
• 06 Approximations – Rounding (18 slides): Explains how to approximate by rounding to the nearest 10, 100, etc.
• 07 Approximations – Decimal Places (8 slides): Explains how to approximate to a fixed number of decimal places. INCLUDED in this download
• 08 Approximations – Significant Figures (8 slides): Explains how to approximate to a fixed number of significant figures.
• 09 Estimating / Checking Answers (11 slides): Explains how to use approximations to estimate / check answers.
• 10 Error Intervals (13 slides): Explains how to find the error intervals of numbers which have been approximated or truncated.
• 11 Error Bounds (9 slides): Explains how to find the minimum and maximum answers for calculations involving approximated values.