Download Math 87 Notes—Lessons 26-30 Terms/Topics Lesson 26: “A way to

Math 87 Notes—Lessons 26-30 Terms/Topics
Lesson 26: “A way to multiply or divide mixed numbers is to rewrite the mixed numbers as improper
fractions. Then, multiply or divide the improper fractions as indicated.”; Example 2a & b and example
5—write the problem from the book & show how to change each to an improper fraction to simplify.
Lesson 27: multiples; least common multiples (lcm); list the first 10 “multiples of 3”; Example 2; “We
can use prime factorization to help us find the LCM of numbers. “To use prime factorization to find the
LCM, 1. write each number as a product of prime numbers, 2. Circle the greatest number of times a
number is used as a factor for one of the numbers, 3. Multiply all the numbers from #2 together to find
the LCM; Example 3; Example 4.
Lesson 28: average; “formula to find average”
formula) before solving
sum of numbers (total )
number of numbers
= average; Ex. 3 (write
Lesson 29: “Rules for rounding whole Numbers”; copy 2 steps from p. 189; do Ex. 2; copy 2 paragraphs
from “Rounding mixed Numbers”; Example 5; estimate; “To estimate, round each number to the first
non-zero place; then, follow the steps to rounding.” Example 6 a-c
Lesson 30: common denominators; “We can rename a fraction by multiplying it by a fraction equal to 1,
like 2/2, or 6/6; Ex. 1; least common denominator; Ex. 2; copy last paragraph on p. 196. Examples 3-4;
“You may use prime factorization to find the LCD because the LCM and the LCD are the same numbers.”