Directions: Physics figures. Answer each question carefully. Make sure your answer includes proper units and significant Math Skills 1. SIGNIFICANT FIGURES WITH ADDITION AND SUBTRACTION: When adding or subtracting measurements, your answer should have the same number of decimal places as the measurement with the least number of decimal places. Do any rounding after you do the addition and subtracting. See the example then try the four samples. example 3.245m 0.267m 2.672kg 2.45m + 1.11 m 389.1s 1.452kg 6.27cc + 7.2m - 376.12s + 6.21 kg 0.2 cc 4.62m 2. SIGNIFICANT FIGURES WITH MULTIPLICATION AND DIVISION: When multiplying or dividing measurements, your answer should contain the same number of significant figures as the measurement with the least number of significant figures (the least precise measurement). See the example of counting significant figures below. Do any rounding after you complete the calculation. example 3.2775 2.8200 0.125 0.0064 1.0004 500 500. 500.00 3.002m x 2m 5 sigfigs 5 sigfigs 3 sigfigs 2 sigfigs 5 sigfigs 1 sigfig 3 sigfigs 5 sigfigs 6m 4.1m (3.271m) 2.6m 3.275m (2. 1m) = 6.224m 2.00m 4.1m (6.45m) (2.0m) = 3. Following the rules of algebra cancel out whatever units you can as you complete these problems. (remember some conversions are exact, like 60 seconds in Iminute, there are exactly 60 seconds in exactly 1 minute so if this is used, the 60seconds and the one minute have an infinite number of significant figures.) Ihr 60s 4500s Imin Iday 12.2hrs- 60 min 60s 60 min 24hr 1hr 1 min