1. Word Problems using Sig. Figs.

2. Word Problems using Sig. Figs.
Ex. (1) Find the average of the following lengths: cm, 23.7 cm, 23.8 cm, 22.9 cm, 23.1 cm, cm, and 23.0 cm.
[when averaging data, use the addition/subtraction rule.]
23.8 cm
23.7 cm
22.9 cm
23.1 cm
23.3 cm cm
true number
163.6 cm  7 = cm
23.4 cm
163.6 cm

3. Word Problems using Sig. Figs.
Ex. (2) What is the volume of a solid block that is cm long, 1.6 cm wide, and 6.3 cm high?
V = L  W  H
V = 2.7 cm  1.6 cm  6.3 cm
V = cm3
V = 27 cm3

4. Word Problems using Sig. Figs.
Ex. (3) What is the density of the solid block in question #2 if its mass is g?
d = m V
d = g
27 cm3
d = g/cm3
d = 2.7 g/cm3

5. Word Problems using Sig. Figs.
Ex. (4) What is the volume of a solid cylinder that has a radius of 1.46 cm and a height of cm? (V = r2h, use 3.14 for )
V = r2h
V = 3.14(1.46 cm)2(7.41 cm)
V = cm3
V = 49.6 cm3

6. Word Problems using Sig. Figs.
Ex. (5) What is the density of the solid cylinder in question #4 if its mass is g?
d = m V
d = g
49.6 cm3
d = g/cm3
d = g/cm3

7. Word Problems using Sig. Figs.
Ex. (6) If a beaker and a marble have a mass of g and the beaker has a mass of g, then what is the mass of the marble?
m = g – g
m = g
m = g

8. Word Problems using Sig. Figs.
Ex. (7) What would be the mass, in grams, of a solid sample of gold if it were the same size and shape as a standard size basketball which has an official volume of 2250 cm3?
d = m V
19.3g/cm3 = X
2250 cm3 1
X = g
X = g

9. Word Problems using Sig. Figs.
Ex. (8) What would be the mass, in lbs, of the gold sample from question 7? [1.00 lb = 454 g]
____________ = ____________ X
43400 g
Cross multiply
and then divide
1.00 lb
454 g
X = lbs
X = lbs