Rounding Rules
How Many Sig Figs?
Calculate!
Convert to SN
Convert to Decimal
100
Keep the last significant figure digit the same and do not round up if the number after is...
What is less than five?
100
172
What is 3?
100

(4.53) + (2.2 ) to 2 sig fig

What is 6.7?

4.53 + 2.2 = 6.73

100

172

What is 1.72 x 10^2?

100

3.69 x 10^2

What is 369?

200
Round the last significant figure digit up if the number after is...
What is greater than five?
200

107.02

What is 5?

200

(2.34 x 10) + (1.92 x 10) to 1 sig fig

What is 40?

23.4+19.2 = 42.6

200

0.502

What is 5.02 x 10^-1?

200

1.56 x 10^4

What is 15600?

300

When are zeros significant in a number ...

What is when they fall between and after significant digits?

300

0.0502

What is 3?

300

(2.130 x 10^3) - (6.6 x 10^2) to standard form

What is 1.47 x 10^3?

2130-660=1470


300

123,453

What is 1.23453 x 10^5?

300

2.59 x 10^2

What is 259?

400
Round 77.0653 to three significant figures.
What is 77.1?
400

0.982 x 10^4

What is 4?

400

(3.5563 x 10^2)(2.0 x 10^1) 1 decimal place

What is 711.3?

355.63 x 2 =711.26

400

98.2 x 10^3

What is 9.82 x 10^4?

400

7.369 x 10^5

What is 736900?

500
Round 0.00023350 to 3 significant figures.
What is 0.000234?
500

3100.0 x 10^2

What is 6?

500
(4.4 x 10^7)/(2.25 x 10^5)
What is 2.0 x 10^2?
500

3100.0 x 10^2

What is 3.1000 x 10^5?

500

459000000 to standard form

What is 4.59 x 108?

M
e
n
u