Name
Period
Date
Scientific Methods Worksheet 2:
Addition and Subtraction with proper precision
1. Write the three steps used to add or subtract with proper precision.
a.
b.
c.
For each of the following problems, circle the least precise measurement then
complete the precision statement. Then in the left blank record the value of the
indicated calculation as given by the calculator. In the right blank express the
answer to the appropriate precision. Remember, all answers must have units!
Hint: Addition and subtraction is all about precision, not about the number of
significant figures!
2. 114.21 g + 3041 g + 0.042 g + 349.5 g =
The least precise measurement is precise to the nearest
3.
1.245 m + 10.4 m + 0.35 m + 2.45 m =
The least precise measurement is precise to the nearest
4.
.
2.040 cm - 1.0 cm =
The least precise measurement is precise to the nearest
5.
.
.
405.4 kg + 32 kg + 1.004 kg =
The least precise measurement is precise to the nearest
.
Scientific Methods Worksheet 2
page 2
6. Calculate the perimeter of a rectangle of sides 95.62 m and 24 m.
The least precise measurement is precise to the nearest
.
7. 42.60 g + 865.200 g + 0.04 g + 34.0000 g =
The least precise measurement is precise to the nearest
8.
2.006 m + 10.0 m + 0.09 m + 2.45 m =
The least precise measurement is precise to the nearest
9.
.
.
5.06700 cm - 2.4030 cm =
The least precise measurement is precise to the nearest
.
10. 500.45 kg + 324.0 kg + 1.43 kg =
The least precise measurement is precise to the nearest
.
11. Calculate the perimeter of a rectangle of sides 90. cm and 1.43 m. Complete in both
cm and m.
The least precise measurement is precise to the nearest
nearest
centimeter.
meter or the