Rules for Significant Figures

This resource explains how to count significant figures in numbers, including non-zero digits, zeros between digits, trailing zeros and leading zeros. Worked examples show how to round answers when adding, subtracting, multiplying and dividing quantities. It also gives brief guidance on calculations involving multiple operations. Practice questions ask learners to identify significant figures in measurements and calculate answers with appropriate precision. The sheet provides a compact reference with exercises, although its guidance on combined operations is oversimplified and its addition example uses imprecise terminology for decimal places.