A pencil measures 8 cm long. What is this length in mm?

Rationale

80 mm

To convert centimeters to millimeters, one must multiply the length in centimeters by 10, since there are 10 millimeters in a centimeter. Therefore, an 8 cm pencil measures 80 mm.

A (80 mm) CORRECT

This choice accurately reflects the conversion from centimeters to millimeters. By multiplying 8 cm by 10, we find that the length is indeed 80 mm, confirming it as the correct answer.

B (800 mm) YOUR ANSWER

This option suggests that 8 cm is equivalent to 800 mm, which is incorrect. The mistake arises from multiplying the centimeters by 100 instead of 10, leading to an inflated measurement that does not correspond to the actual length.

C (8 mm) YOUR ANSWER

This choice incorrectly implies that 8 cm is equivalent to 8 mm. This error stems from misunderstanding the conversion factor, leading to a significant underestimation of the length, as 8 cm is much longer than 8 mm.

D (0.8 mm) YOUR ANSWER

This option is also incorrect as it suggests that 8 cm equals 0.8 mm. This severe miscalculation arises from dividing instead of multiplying, reflecting a fundamental misunderstanding of the metric conversion between centimeters and millimeters.

Conclusion

The conversion from centimeters to millimeters requires the use of a factor of 10. Thus, an 8 cm length accurately converts to 80 mm. The other options represent either incorrect multipliers or a fundamental misunderstanding of metric conversions, highlighting the importance of accurate unit conversion in measurements.

A pencil measures 8 cm long. What is this length in mm?

80 mm

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