1. SWTJC STEM – ENGR 1201 Content Goal 14 Rounding Rules 1.In general, an answer should be given in engineering or scientific notation unless it is between 1 and 999.99... 2.In general, for calculations involving multiplication and division, round the answer to the number of significant digits of the least precise number involved. 125.6  0.62 = 77.872 = 78 3.In general, for calculations involving addition and subtraction, round the answer to the least accurate value. Unless otherwise indicated, use the smallest valued digit in each number to determine accuracy. 18.018 + 2.14 = 20.158 = 20.16 Least Accurate Number (nearest hundredth)

2. SWTJC STEM – ENGR 1201 Content Goal 14 Rounding Rules However, in class and unless otherwise instructed complete the calculation, then round to three significant digits. (23.45 + 181.3) / 829.1 = 0.246954529 = 2.47  10 -1

3. SWTJC STEM – ENGR 1201 Content Goal 14 More Examples CalculationCalculator Ans General Ans Class Ans 32.432. 0.012 / 33.3 11.687207 12 0.012 is least precise 12.7 Std. Notation 243.1 + 93.023 - 143.82 192.303 192.3 243.1 is least accurate 192 Std. Notation 125. (718.4m + 8.78m)= 125. 727.18m = 125. 727.2m = 90,900m90.9. 10 3 m Engr. Notation 125 is least precise 90.9km Appro. Unit!