Lesson 4-1

Printed Notes Lesson 4-1

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Lesson 4-1 "Divisibility and Factors"
Part 1 "Using Divisibility Tests"

1. Divisibility Tests:
    2 if it ends in 0, 2, 4, 6, or 8.
    5 if it ends in 0 or 5
10 if it ends in 0
    3 if the sum of its digits is divisible by 3
    9 if the sum of its digits is divisible by 9
2. Calculator with remainder 0, but ...

Part 2 "Finding Factors"

3. EX: 10 = 1●10 or 2●5 so 1, 2, 5, and 10
EX: 36 = 1●36, 2●18, 3●12, 4●9 & 6●6 so
36 → 1, 2, 3, 4, 6, 9, 12, 18, and 36

This page was last modified 01/07/08