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Grade 5 · Maths · Lessons
Changing units
🥛pints🥤quarts⏱️hours🛢️gallons
Changing units.
The big ideaSmaller unit, bigger number. Bigger unit, smaller number.

How it works

A smaller unit means a bigger number. A bigger unit means a smaller number.

Going to a smaller unit: multiply. Going to a bigger unit: divide.

Know the fact: 1 quart = 2 pints, 1 gallon = 4 quarts, 1 hour = 60 minutes.

Liquid• 1 qt = 2 pt• 1 gal = 4 qtTime• 1 hr = 60 min• 1 min = 60 s
Unit facts.

Example 1: Quarts to pints

  1. 6 qt = ? pt
  2. 1 quart is 2 pints.
  3. 6 × 2 = 12.
  4. So the answer is 12.

Example 2: Minutes to hours

  1. 720 min = ? hr
  2. 1 hour is 60 minutes, so divide.
  3. 720 ÷ 60 = 12.
  4. So the answer is 12.

Example 3: Gallons to quarts

  1. 9 gal = ? qt
  2. 1 gallon is 4 quarts.
  3. 9 × 4 = 36.
  4. So the answer is 36.

Words to know

convert
To change to another unit.
unit
A fixed amount used to measure.

Watch out

Try it

  1. 2 lb = ? oz
  2. At Ana's stall, a song lasts 4 point 5 minutes. 30 seconds have gone by. How many seconds are left?
  3. At Ana's stall, a sack of flour weighs 1 point 5 kilograms. Ana fills bags with 250 grams each. How many bags can Ana fill?
Answers: 1. 32 · 2. 240 · 3. 6
For grown-upsUse a recipe: how many cups in 3 quarts?
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