Larger to Smaller → MULTIPLY

Smaller to Larger → DIVIDE

kilo- (k) = 1,000 (thousand)

hecto- (h) = 100 (hundred)

deka- (da) = 10 (ten)

base unit = 1 (meter, gram, liter)

deci- (d) = 0.1 (tenth)

centi- (c) = 0.01 (hundredth)

milli- (m) = 0.001 (thousandth)

Note: ≈ means "approximately equal to" because these are rounded values!

Celsius to Fahrenheit:

°F = (°C × 9/5) + 32

Fahrenheit to Celsius:

°C = (°F − 32) × 5/9

Problem: 3 ft 8 in + 2 ft 9 in

Problem: 4 lb 6 oz × 3

Length:

• 1 inch ≈ width of your thumb

• 1 foot ≈ length of a ruler

• 1 yard ≈ one big step

Weight:

• 1 ounce ≈ slice of bread

• 1 pound ≈ loaf of bread

Length:

• 1 millimeter ≈ thickness of a dime

• 1 centimeter ≈ width of your pinky finger

• 1 meter ≈ width of a doorway

• 1 kilometer ≈ 10 minute walk

Mass:

• 1 gram ≈ paperclip

• 1 kilogram ≈ textbook

✓ Larger to smaller → MULTIPLY

✓ Smaller to larger → DIVIDE

✓ Memorize: 12 inches = 1 foot

✓ Memorize: 3 feet = 1 yard

✓ Metric is based on 10s (easy to convert!)

✓ King Henry mnemonic for metric prefixes

✓ Water freezes: 0°C = 32°F

✓ Water boils: 100°C = 212°F

✓ 1 inch ≈ 2.54 cm (key conversion)

✓ Always write units in your answer!

Customary Capacity:

"Good Queen Victoria Purchased Tea" (Gallon, Quart, Pint, Cup)

Metric Prefixes:

"King Henry Died By Drinking Chocolate Milk"

Temperature:

"30 is hot, 20 is nice, 10 is cold, 0 is ice!" (Celsius)

Feet to Inches:

"A foot has 12 inches, just like a year has 12 months!"

Conversion Direction:

"Big to little, multiply a lot! Little to big, divide - that's the trick!"