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