Significant Figure Worksheet
Name(s) ___________________
1. How many significant figures are in each of the following numbers? Place your answer in the
box provided.
1.234
4
1234
4
1.2340
5
12340
4
4
0.012340
5
5
10.0
3
1.234 x
10-3
1.2340 x 10-3
3.14159
6
3.1416
5
2. Complete the following arithmetic operations and express the answer with the correct number
of significant figures. Place your answer in the box provided.
1.421+ 0.4372 =
1.858
1.0123 - 0.002 =
1.010
0.0241 + 0.11 =
0.13
123.69 - 20.1 =
103.6
0.14 + 1.2243 =
1.36
47.2 - 0.01 =
47.2
760.0 + 0.011 =
760.0
1.234 + 0.6125 =
1.846
273.15 + 32.1 =
305.2
1.00 - .01 =
0.99
3. Perform the following operations and express the answers with the correct number of
significant figures. Place your answer in the box provided.
42.3 x 2.61 =
1.10X102
6.450 x 1.010 =
6.514
0.61 x 42.1 =
26
(1.23)(3.467)/3.96 =
1.08
38.1
46.1 / 1.21 =
5.7
23.2 / 4.1 =
220
25.7x8.6 =
1.23/(3.467/3.96) =
1.40
1010 x 3001 =
3030000
1.80(25.3) =
45.5
4. Perform the following operations and express the answers with the correct number of
significant figures. Place your answer in the box provided.
(1.80)(3.4) + 32.00 =
38.1
100.5 + 273.15 =
373.6
(55.41 – 54.79)/55.32 =
0.011
(3.41)(3.14) + (3.96)/(4.31) =
11.6
1.80(25.3) + 32
78
5. Some of the following numbers have more than two significant figures. Round each of these
to two significant figures. Place your answer in the box provided. For those numbers with two
or fewer significant digits, place an “X” in the box.
9,000
X
105.2
1.1X102
89.235
89
985.12
990
2130
21000
910.02
910
123.000
120
900.
9.0X102
97.502
98
1000.3
1.0X103
6. Using the given “x” values, solve for “y” using the equation below. Make sure your answers
have the correct number of significant figures.
y = 1.80x + 32.0
x = 2.0
35.6
x = 5.0
41.0
x = 2.1
35.8
x=5
41
x = 12
54
x = 99
210
x = 4.8
40.6
x = 1.00
33.8