1. Complete the following calculations
Record the answer from calculator
Round answer to correct # of SF’s

2. 8.80 x 45.9 Calculated answer: 403.92 Correct SF’s: 404
Each number used in calculation has 3 SF’s

3. 4.28 / 1.327 Calculated answer: 3.225320271 Correct SF’s: 3.23
4.28 has 3 SF’s, has 4, answer can only have 3 SF

4. 0.058 / 78.2 Calculated answer: 0.000741688 This is also reported as
x10-4 (the zeroes go away, not SF here)
E-4
Correct SF’s: 7.4x10-4
0.058 has 2 SF, 78.2 has 3

5. 4.591 + 3.2 Calculated answer: 7.791 Correct SF’s: 7.8
4.591 has 4 SF, but 3.2 only has 2 SF

6. 4.79-1.210 Calculated answer: 3.58 Correct SF’s: 3.58
4.79 has 3 SF, has 4

7. Make the Following Metric Conversion
Be able to show your work
If you do the math way or moving decimal point way

8. 840 mL  L
840 mL x (1L/1000mL) = L
Think about this, you’re converting a small unit, mL, to a larger unit, L. You will need fewer L to equal 840 mL. The answer here makes sense.
M_ _KHD_dcm_ _ μ_ _ n

9. km  mm
Think, a large unit, km, converting to a small unit, mm. My number should get larger.
km x (1000m/1km) = m
m x (1000mm/1m) = mm
M_ _KHD_dcm_ _ μ_ _ n

10. 23.4 μm  cm
23.4μm x (1mm/1000μm) = mm
0.0234mm x (1cm/10mm) = cm
M_ _KHD_dcm_ _ μ_ _ n