Count Those Sig Figs!
How many significant figures are in 450.0?
4
Round 5.678 to 2 sig figs
5.7
A desk is measured at 1.250 meters using a ruler with cm precision. How many sig figs?
3
True or False: Leading zeros are never significant
True
Say if the student is correct. If you say they are incorrect, provide the correct answer.
A student says 0.0090 has 1 sig fig
The student is incorrect. Correct number? → 2
How many significant figures are in 0.00780?
3
Round 0.008932 to 2 sig figs
0.0089
Solve:
3.40 m × 2.1 m
7.1 m²
Which zeros are significant in 405.00
All of them
Rounding 98.76 → 99.0 to 2 sig figs — correct?
No, it should be 99
How many significant figures are in 602,000?
3
How could you make the zeros significant?
Round 24,765 to 3 sig fig
24,800
98.672°F rounded to 3 sig figs
98.7°F
Trailing zeros are only significant if _____________.
There is a decimal
Say if the student is correct. If you say they are incorrect, provide the correct answer.
A student claims 7.8900 has 3 sig figs?
The student is incorrect, it has 5
Which of these has 2 sig figs?
A) 0.0200
B) 1.02
C) 0.0021
D) 91
D
Why?
0.004321 to 1 sig fig
0.004
Add 12.3 g + 0.52 g + 7.48 g
20.3 g
Explain why 600 has 1 sig fig but 600.0 has 3
Decimal makes trailing zeros significant
What’s wrong with rounding 0.00467 to 1 sig fig as 0.0050?
That’s 2 sig figs
Which number has exactly 5 sig figs?
A) 100.00
B) 0.00050
C) 3.1416
D) 1000
A
Round 6.9999 to 3 sig figs
7.00
A graduated cylinder measures 15.0 mL of water. You add a rock and the new volume is 20.45 mL. What is the rock’s volume, reported with correct sig figs?
5.5 mL
A student reports 0.005610 with 3 sig figs. Are they correct?
No, it's 4 sig figs
Student multiplies 1.0 × 2.34 and gets 2.34. What's wrong?
Answer should be 2.3