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+1 vote
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in Chemistry by (31.1k points)
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Round off each of the following quantities to three significant figures :

a. 1.43 cm3

b. 458 × 102cm 

c. 643 cm2 

d. 0.039 m 

e. 6.398 × 10-3km 

f. 0.0179 g 

g. 79,000 m 

h. 42,150 

i. 649.85 

j. 23,642,000 mm 

k. 0.0041962 kg

1 Answer

+2 votes
by (30.3k points)
selected by
 
Best answer

a. 43 cm3

b. 4.58 × 104cm 

c. 643 cm2 (or 6.43 × 102cm2

d. 0.0390 m (or 3.90 × 10-2m) 

e. 6.40 × 10-3km 

f. 0.0179 g (or 1.79 × 10-2m) 

g. 7.90 × 104

h. 4.22 × 104 (or 42,200) 

i. 6.50 × 102 

j. 2.36 × 107mm 

k. 0.00420 kg (or 4.20 × 10-3kg)

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