Solution:

a) 5700

b) 5735

c) 4740

Here, 5735 is the nearest whole number to 5734.7

Solution:

i)2.007

ii)0.003

iii) 0.20

Here, 2.007 has 4 significant figures.

Solution:

i) 7.02 ii) 7.01 iii) 7.06

Here, 7.01 is the correct answer.

Solution:

12.756

= 12.8 ( 1 d.p)

Therefore, 12.756 = 12.8

Solution:

0.00456

=0.0

Therefore, 0.00456 = 0.0

Solution:

To round to 1 decimal place, look at the second decimal place, It's 4 and it is smaller than 5.So round up,

4.543 = 4.5(1 d.p.)

Therefore, 4.543 = 4.5(1 d.p.)

Solution:

0.00213

= 0.0 (1 d.p.)

Solution:

a) 4.6 b) 4.644 c) 4.64

Here, 4.644 is the correct answer.

Solution:

0.07245

=0.0725

Therefore, 0.07245 = 0.0725( 3 s.f)

Solution:

0.0037

=0.004(1 s.f)

Therefore, 0.0037 = 0.004.

Solution:

To, round to four significant figures, look at the fifth significant figure. It's a 1, so round down,

 0. 2500107

Therefore, 0.2500107 = 0.2500 (4 s.f)

Even though 0.2500 is the same as 0.25, include the zeros to show you have rounded to 4 significant figures.

Solution:

To round to second significant figures, look at the third significant figure. It's 3, so round down,

 0.043

Therefore, 0.0433 = 0.043 ( 2 s.f)

Solution:

To round to three significant figures, look at the fourth significant figure. It's a 5, so round up

 0.0724591

Therefore, 0.0724591 = 0.0725 ( 3 s.f)

Solution:

To round to 3 significant figures, look at the fourth significant figure. It's 7, so round down,

 0.2607

Therefore, 0.2607 = 0.261 (3 s.f)

Solution:

To round to four significant figures, look at the fifth significant figure. It's 6, so round down,

 324.064

Therefore, 324.064 = 324.100

Solution:

To round to four significant figures, look at the fifth significant figures. It's 6, so round down,

 2.00456

Therefore, 2.00456 = 2.0046

Solution:

To round to three significant figures, look at the fourth significant figure. It's a 7, so round down,

 0.2607

Therefore, 0.2607 = 0.261

Solution:

To round to three significant figures, look at the fourth significant figures. It's a5, So round down,

 2.055

Therefore, 2.055 = 2.06 (3 s.f)