Abbreviations:
mm = millimeter
m = meter
cm = centimeter
Helpful facts:
1 m = 1000 mm
1 m = 100 cm
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Let's convert 0.328 m to cm. To do so, first start with
1 m = 100 cm
and multiply both sides by 0.328
0.328*(1 m) = 0.328*(100 cm)
0.328 m = 32.8 cm
Now convert 315 mm to cm. First convert from mm to meters
1 m = 1000 mm
0.001 m = 1 mm ... divide both sides by 1000
1 mm = 0.001 m
315*(1 mm) = 315*(0.001 m) ... multiply both sides by 315
315 mm = 0.315 m
Then convert this value to cm
1 m = 100 cm
0.315*(1 m) = 0.315*(100 cm)
0.315 m = 31.5
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The number Sasha is thinking about is between 31.5 cm and 32.8 cm. This number is a whole number. The only thing that fits is the number 32. Draw out a number line to help see this.
Answer: 32 cm