The document provides lesson material for math lesson 55, including: 1) An assignment of odd problems from set 55 due on March 12th 2) Warm-up problems simplifying fractions and solving equations 3) An explanation that finding the average of a data set involves adding all the numbers and dividing by the total numbers. It also explains how to find a missing number if you know the average and other numbers. 4) Examples A through F to demonstrate finding averages and missing numbers from data sets.

1. lesson 55.notebook March 08, 2013
Assignment:
1-->Set 55 (odds) - Due Tuesday (3/12)

2. lesson 55.notebook March 08, 2013
Lesson 55 Warm-Up:
1) Simplify: 3 5/10 + (9 1/2 - 6 2/3)
2) Simplify: 112 + 13 - 121
3) Simplify: 26
22
4) Solve: 24 36 5 cm
r 27
3 cm
8 cm
6 cm
5) Find the perimeter:
5 cm
9 cm

3. lesson 55.notebook March 08, 2013
Lesson 55:
*FYI...To find the average of a set of numbers-->
add them up and divide by the number of numbers!
***If you are given what the average is and have to find one of the
missing numbers in the set of data...you have to work backwards...
--ADD the numbers you HAVE been given...
--MULTIPLY the average by how many numbers in the set of data...
--SUBTRACT the sum from the product!

4. lesson 55.notebook March 08, 2013
Lesson 55 Examples:
pg. 389
A)
B)

5. lesson 55.notebook March 08, 2013
C)
D)

6. lesson 55.notebook March 08, 2013
E)
F)

7. lesson 55.notebook March 08, 2013