Measurement Conversion

Measurement Conversion

Magic Numbers

What are Magic Numbers?

• The "relationship" between two units of measurement

• The magic number is the number that specifies the difference between two measurements.

Horse = larger unit & fly = smaller unit

Convert the measurement

• 9 yards = ______ feet

• Which unit is larger?

• Are you converting a smaller unit into a larger unit, or a larger unit into a smaller unit?

Multiple Choice

9 yards = ____ feet

Is yards the smaller or larger unit?

• smaller

• larger

Convert the measurement

• 9 yards = ______ feet

• Yards is the larger unit, so...

• Convert a larger unit to a smaller unit means - Horse to fly, MULTIPLY!

• 3 feet = 1 yard, so the "magic number" is 3, this is the number you will multiply by.

Multiple Choice

Convert

9 yards = ______ feet

3 feet = 1 yard

• 12 feet

• 27 feet

• 9 feet

Let's try some more!

Horse to fly, MULTIPLY...Fly to horse, DIVIDE of course

Multiple Choice

Step 1: Horse to fly or Fly to Horse? (larger to smaller or smaller to larger)

84 inches = _____ feet

• Horse to fly

• Fly to horse

• I have no idea...

Fly to horse, DIVIDE of course!

Now for Step 2...

Multiple Choice

Step 2: What is the "magic number" between inches and feet?

Look at the conversion chart in the image.

• 12 inches = 1 foot

• 6 inches = 1 foot

• 12 inches = 1 yard

12 inches = 1 foot

The magic number is 12

Multiple Choice

Step 3: Divide

84 inches = _____ feet

84  $\div$  12 =?

• 7 feet

• 6 feet

• 9 feet

Practice Time...

Are you ready??

Multiple Choice

7 yards = _____ feet

3 feet = 1 yard

• 10 feet

• 21 feet

• 2.5 feet

Multiple Choice

96 feet = _____ yards

3 feet = 1 yard

• 99 yards

• 64 yards

• 32 yards

Multiple Choice

2 yards = ____ inches

12 inches = 1 foot

3 feet = 1 yard

• 6 inches

• 72 inches

• 24 inches