TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? DO NOW: ( 5.

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Presentation transcript:

TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? DO NOW: ( 5 mins ) 1. 2.

Adding and Subtracting TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? Adding and Subtracting Line up the decimal points and add/subtract the #s Final answer is rounded off with the least number of decimal places. 25.2 cm + 1.34 cm 25.2 cm + 1.34 cm 26.54 cm answer 26.5 one decimal place one decimal place two decimal places

answer 66.12 mL 2 decimal places TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? Sample Problem: 92.535 mL - 26.42 mL 92.535 mL - 26.42 mL 66.115 mL answer 66.12 mL 2 decimal places three decimal place two decimal places

Multiplying and Dividing TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? Multiplying and Dividing Line up the decimal points and multiply/divide the #s Final answer is rounded off with the least number of significant figures. 9.23 kg x 0.16 kg 9.23 kg X0.16 kg 1.4768 kg answer 1.5 kg 2 S.F. 3 S.F. 2 S.F.

Learning Check A. 235.05 + 19.6 + 2.1 = B. 58.925 - 18.2 = TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? Learning Check In each calculation, round the answer to the correct number of significant figures. A. 235.05 + 19.6 + 2.1 = B. 58.925 - 18.2 = C. 2.19 X 4.2 = D. 4.311 ÷ 0.07 = E. 2.54 X 0.0028 = 0.0105 X 0.060

TOPIC: Significant Figures in calculations AIM: How do we add, subtract, multiply and divide measurement in significant figures? HOMEWORK In each calculation, round the answer to the correct number of significant figures. A. 53.5 + 79.1 + 8.7 = B. 108.725 - 98.1 = C. 5.19 X 1.2 = D. 5.301 ÷ 0.16 = E. 4.54 X 0.0078 = 0.0205 X 0.160