Approximation

Round 0.813 to the nearest whole number.

Write 4.92 correct to 1 decimal place (d.p.)

Write 4.377 correct to 2 decimal places (2 d.p.)

How many significant figures are there in 0.0054 grams?

• 1

• 2

• 3

• 4

How many significant figures are there in 10.020 moles?

• 2

• 3

• 4

• 5

Identify, how many significant figures does the following number have?

 $0.00509$  

True or False:

When writing

a number in standard form,

the first number must be

greater than 1 but less than 10.

• FALSE

• TRUE

What is 6.7 × 10⁴ written

as an ordinary number?

• 67000

• 6700

• 670000

• 0.00067

What is 45,000 written in standard form?

• 45 × 10³

• 4.5 × 10⁴

• 4.5 × 10³

What is 0.00051

written in standard form?

• 5.1 × 10^-4

• 51 × 10^-4

• 5.1 × 10^-5