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 x 10^5) + (2.2 x 10^6)
What is 2.6 x 10^6?
100
172
What is 1.72 x 10^2?
100
3.69 x 10^-2
What is 0.0369?
200
Round the last significant figure digit up if the number after is...
What is greater than five?
200
107.2
What is 4?
200
(2.34 x 10^24) + (1.92 x 10^23)
What is 2.53 x 10^24?
200
0.502
What is 5.02 x 10^-1?
200
1.56 x 10^4
What is 15600?
300
Make the last significant figure digit even if the number after is...
What is equal to five?
300
0.502
What is 3?
300
(2.130 x 10^3) - (6.6 x 10^2)
What is 1.5 x 10^3?
300
123,453
What is 1.23453 x 10^5?
300
0.00259 x 10^5
What is 259?
400
Round 77.0653 to three significant figures.
What is 77.1?
400
0.982 x 10^-3
What is 3?
400
(3.5 x 10^2)(6.45 x 10^10)
What is 2.2 x 10^13?
400
0.982 x 10^-3
What is 9.82 x 10^-4?
400
736.9 x 10^5
What is 73690000?
500
Round 0.00023350 to 3 significant figures.
What is 0.000234?
500
3100.0 x 10^2
What is 5?
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
0.000459 x 10^-1
What is 0.0000459?
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