GCSE Maths

Significant Figures

Here are some numbers with their significant figures (S.F.) given and a reason why:

3653All digits from 1 to 9 are significant.
50054Zero digits are significant when between other numbers.
0·00122The zeros show the position of the decimal point.
Using standard form, we could write 1·2 × 10-3.
This has no leading zeros, but still 2 s.f.
9003The zeros here are part of the number.

As we shall see, numbers like 900 are sometimes assumed to have 1 s.f. only!

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