chemistry

1. 35cm + 8.3m + 75.341 km + 80,000 mm = ____________

2.(43.7m + 39.3cm) ÷ 25.332 m/s = _____________

* focus on significant figures

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asked by aira
  1. I would change all of these to km. Note that with no period after the 80,000 mm. that has only one s.f.

    0.000035 km
    0.0083 km
    75.341 km
    0.08 km
    ---------
    75.429335 which I would round to 75.43

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  2. is # 2.(43.7m + 39.3cm) ÷ 25.332 m/s = _____________

    1.741 seconds then?

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    posted by aira
  3. 43.7 has only 3 s.f.
    Add that to 0.393 for an answer with 3 s.f. and divide by 4 s.f. so you may have only 2 in the answer. 1.741 has 4 which is one too many.

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