A LITTLE LIGHTBULB MOMENT
Pharmaceutical calculations and dimensional analysis
Metric ladder jumps by powers of ten
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Think metric stairs: each step is tenfold, not random.
The idea behind the cue
Metric conversions use powers of 10. Moving to a smaller unit multiplies by 10 per step; moving to a larger unit divides by 10 per step. This is the foundation for mg, g, mcg, mL, and L conversions.
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Short & simple
Think metric stairs: each step is tenfold, not random.
Acronym
MD — Mischievous Ducks.
Story
A pharmacist robot climbs stairs labeled M, k, base, c, m. Each step is exactly ten times apart. When it skips a step, the robot lands in a pile of unit confusion and starts over.
Connect the pieces
- M (Mischievous) → Multiply: Moving to a smaller metric unit, multiply by 10 for each step.
- D (Ducks) → Divide: Moving to a larger metric unit, divide by 10 for each step.
- Mischievous · Multiply: Moving to a smaller metric unit, multiply by 10 for each step.
- Ducks · Divide: Moving to a larger metric unit, divide by 10 for each step.
Know the limits
Applies to metric units; do not use for non-metric household measures like teaspoons or cups.
Further reading · OpenStax Pharmacology for Nurses · foundational mechanisms ↗Check your understanding
Which conversion is correct?
A. 1 mg = 1,000 g
B. 1 L = 1,000 mL
C. 1 mcg = 1,000 mg
D. 1 g = 1,000 mg
Reveal explanation
1 L = 1,000 mL
In the metric system, a liter is 1,000 milliliters. The other options reverse the correct relationships.