Math

• Rates compare quantities measured in different units
• All rates must include units for each quantity
• The two different units are separated by a slash / which is the mathematical term for per
• you always simplify
• Always write rates in their simplest form
• If the rate involves money, then that amount always comes first
• The average rate is calculated by dividing the total change in one quantity by the total change by the second quantity
• 1 : 3 = 4 : 12
• 2 : 5 = 4 : 10
• 5 : 10 = 1 : 2
• 12 : 18 = 2 : 3
• 4 : 7 = 44 : 77
• 27 : 6 = 9 : 2
• 1 : 7 : 9 = 7 : 49 : 63
• Simplify 2 : 8

  1 : 4
• Simplify 4 : 24

  1 : 6
• Simplify 8 : 10

  4 : 5
• Simplify 21 : 28

  3 : 4
• Simplify 18 : 14

  9 : 7
• Simplify 45 : 35

  9 : 7
• Simplify 51 : 17

  3 : 1
• Simplify 300 : 550

  6 : 11
• Simplify 1200 : 100

  12 : 1
• 2 : 3 : 5 = 4 : 6 : 10