New York Science Grade 7

Chapter 21: Bacteria, Protists, and Fungi

Solve a one step equation

1
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across the top of a bottle cap with a diameter of 3 cm?
A)15,000 E. coli
B)120,000 E. coli
C)135,000 E. coli
D)165,000 E. coli
2
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across the top of a water faucet with a diameter of 4.2 cm?
A)21,000 E. coli
B)11,000 E. coli
C)11,500 E. coli
D)13,000 E. coli
3
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across the top of a garden hose with a diameter of 2 cm?
A)10,000 E. coli
B)20,000 E. coli
C)25,000 E. coli
D)27,000 E. coli
4
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across the top of a coin with a diameter of 90 mm?
A)45,000 E. coli
B)42,000 E. coli
C)48,500 E. coli
D)41,500 E. coli
5
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across a battery with a diameter of 45 mm?
A)22,500 E. coli
B)25,000 E. coli
C)27,400 E. coli
D)29,000 E. coli
6
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across the top of a package of candy with a length of 8.5 cm?
A)42,500 E. coli
B)42,200 E. coli
C)44,000 E. coli
D)41,000 E. coli
7
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across a package of gum with a length of 5.5 cm?
A)27,500 E. coli
B)22,500 E. coli
C)28,900 E. coli
D)29,050 E. coli
8
One E. coli bacterium has a length of 0.002 mm. How many E. coli would fit across a magnet with a diameter of 40 mm?
A)20,000 E. coli
B)18,500 E. coli
C)22,000 E. coli
D)17,000 E. coli
9
There are 45,000 E. coli cells end-to-end on a safety pin. How long is the safety pin?
A)90 mm
B)94 mm
C)96 mm
D)100 mm
10
There are 50,000 E. coli cells end-to-end on a pencil. How long is the pencil?
A)10 cm
B)12 mm
C)6 mm
D)8 mm
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