Chapter 12

Chapter 12

1. 12:02 SIMPLYFING RATIOS

   • 100:250 = 100 250 (AS A FRACTION) = 2 5 ( AS A FRACTION) = 2:5
   • RULE - to simplyfy ratios, trat like a fraction and cancel!

2. 12:01 RATIOS

   • eg a:b
     • a comparison of 2 amounts
   • eg cordial is 3 parts water and 1 part cordial
     • ratio = 3:1
   • 100 grams of sugar and 250 grams of flour
     • sugar to flour = 100:250 simplified = 10:25

3. 12:03 RATIO PROBLEMS

   • The number of green lollies to red lollies was 3:4. Amber counted 24 red lollies, how many green lollies were there?
     • = 32 green

4. 12:04 RATES

   • A comparison of 2 different quanities
     • written as _/_
       • eg km/h,m/$/kg/g etc
   • eg 2 kilograms of steak for $30 per kilogram
     • rate = $30 2kf (AS A FRACTION)
       • = $15/kg

5. 12:05 BEST BUYS

   • Cola - 2L = $1.50
     • Coola - 3L = $3
       • Caka - 1.5L =$1.20
       • Which was the best buy??
         • Cola
   • judging the prices and capacity

6. 12:06 RATE PROBLEMS

   • eg A car travels at 40 km per hour how far does it travel in 5 hours?
     • 40 in 1hr
       • 50 in 2 hr
         • 200 in 5 hr