The Order of Operations

1
The Order of Operations

• Mary walked n miles one way each day and back for
  5 days out of a week. She walked the same number
  of miles each week for a year. How many miles
  would she have walked in a year?

2
Simplify expression

• Let n equal to the number of miles Mary walked
  one way
• Miles walked per day 2n
• Miles walked per week 5(2n)
• Miles walked per year 525(2n)

3
Solve expression using substitution

• Let n 5 miles
• 525(2n)
• 525(25)
• 525(10)
• 5250
• 2600 miles

4
The Order of Operations

• Mary has a friend Anglia who walks x miles one
  way each day and back. She walked every other
  week for 5 days out of a week. How many miles
  will Anglia walk in a year?

5
Simplify the expression

• Let x equal to the number of miles Anglia walked
  one way
• Miles walked per day 2x
• Miles walked per week 5(2x)
• Miles walked per year 265(2x)

6
Solve the expression using substitution

• Let x 10 miles
• 265(2x)
• 265(210)
• 265(20)
• 26100
• 2600 miles

7
Properties of Equality

• Compare Marys and Anglias miles walked per
  year.
• 525(2n)265(2x)
• When n 5 miles and x 10 miles
• 525(25)265(210)
• 525(10)265(20)
• 525026100
• 2600 miles2600 miles

8
In conclusion

• How do the number of miles Mary and Anglia walk
  in a year compare? They are both equal.