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DATA

NEXUS

- EDEXCEL GCSE
- AQA GCSE
- OCR GCSE
- EDUQAS GCSE

When adding or subtracting decimals, align the decimal points and then perform the operation as you would with whole numbers. When multiplying, convert the decimals to whole numbers and then times. Don't forget to convert them back. When dividing, use the bus stop method.

\[12.34 + 5.67\]

Use the column method for adding and subtracting decimals.

\begin{align} 12.34& \\ \underline{+\quad 5.67}& \\ 18.01& \end{align}

\[1.2 \times 0.35\]

Multiply each decimal by a power of 10 (10, 100, 1000) to convert to whole numbers.

\[1.2 \times 10 = 12\]

\[0.35 \times 100 = 35\]

Multiply the whole numbers.

\[12 \times 35 = 420\]

Undo the \(\times 10\) and \(\times 100\) using division.

\[420 \div 10 \div 100 = 0.42\]

Use the bus stop method. Make sure to add zeros after the decimal point if needed.

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