1. Dividing with Significant Figures

2. In calculations, the accuracy of the calculated result is limited by the least accurate measurement involved in the calculation. Division ▫After dividing the numbers, you then round the result off so it has the same number of significant figures as the component with the smallest number of significant figures.  12.60 / 3.0 = 4.2  4.2 (4 s.f.) (2 s.f.) (2 significant figures)  4.840 – 4.30 = 1.12558  1.13 (4) (3) (3)

3. Rules for Rounding 1.If the digit to be dropped is more than 5, the digit just to the left of it goes up by 1. ▫12.6  13 2.If the digit to be dropped is less than 5, the digit just to the left stays the same. ▫12.4  12 3.If the digit to be dropped equals 5 and 1.The number after it is not a zero, then the digit just to the left goes up by l.  12.51  13 2.The number after it is a zero, then 1.If the number to the left is odd, round up.  11.5  12 2.If the number to the left is even, round down.  12.5  12