Significant Figures, Rounding, Fractions

How many significant figures are there in a substance with a mass of 0.042 grams?

• 0

• 2

• 3

• 4

Which of the following numbers is not a rational number?

• 1/2

• 2/5

• 0.35

• 3/8

How many significant figures are there in 0.0020 ?

• 1

• 2

• 5

• none of these

Number of significant figures in 36

• 1

• 2

• 0

• 5

State the following number 456.7 to 3 significant figures

• 457

• 460

• 456.70

• 4560

Round 0.03219 to 3 significant figures

• 0.0322

• 0.03

• 0.321

• 322

Round 0.00347009 to 2 significant figures?

• 0.34

• 34

• 0.0034

• 0.0035

Khaled says 553 rounds to 600 and Ahmad says 553 rounds to 550. Who is the correct if they are rounding for two significant figures?

• Ahmad

• Ali

• Both

• None

The largest fraction amongst 3/8, 4/8, and 7/8 is:

• 7/8

• 4/8

• 3/8

• All have same value

Decimal number 1.75 is equal to?

• 9/5

• 7/4

• 10/3

• 5/9