# chemistry

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

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

* focus on significant figures

• chemistry -

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

• chemistry -

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

1.741 seconds then?

• chemistry -

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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