Rounding Sig Figs

Round to 3 sig figs- 1.5436

• 1.54

• 1.544

• 1.5400

• 1.54360

Answer explanation

Only one of these answers has 3 sig figs! Remember that for numbers after the decimal, you just drop them off. You do not turn them into zeros. That is for numbers before the decimal.

Round to 3 sig figs- 15,436

• 154

• 15,400

• 1.54

• 15,500

Answer explanation

Always ask yourself after rounding... is that about the same number? If I owe you $15,436, would $1.54 or $154 be an acceptable amount to pay you back? NO! They are not the same number! $15,400 is about the same as what I owe you.

Round to 3 sig figs- 180

• 1.80x10²

• 1.80x10^-2

• 180

• 1.80

Round to 3 sig figs- 0.5641

• 0.5640

• 0.564

• 0.56

• 0.600

Answer explanation

For numbers after the decimal, you just drop them off. Do not make them into zeros.

Round to 3 sig figs- 1234

• 1.23

• 1230

• 1240

• 1234

Answer explanation

For numbers before the decimal, you need to change the rest to zeros or it's not the same number. We are rounding numbers. Not changing them!

How many Significant Figures in the number below?
0.456

• 3
• 4
• 2
• 1

How many Significant Figures in the number below?
4,500

• 3
• 4
• 2
• 1

How many Significant Figures in the number below?
400,506

• 5
• 4
• 6
• 3

How many Significant Figures in the number below?
4,560

• 5
• 4
• 6
• 3

How many Significant Figures in the number below?
406,000

• 5
• 4
• 6
• 3