Fractions_ Greatest Common Factor and Simplest Form

Document Sample
Fractions_ Greatest Common Factor and Simplest Form Powered By Docstoc
					Fractions
Greatest Common Factor & Simplest Form By Rosi Barron

<--- To Teacher Page

•Fifth grade Fractions: GCF & Simplest Form

•Tips:
-Teachers, please read through the whole presentation prior to the activity.

-Each activity is meant to be used in addition to your classroom teaching.
-Each activity includes a journal component.

•OBJECTIVES:
TSW identify factors & use models to represent fractions in simplest from.

GCF (Greatest Common Factor) is the largest factor that can be divided into both the numerator & the denominator. A fraction is in SIMPLEST FORM when the GCF of the numerator and denominator is the number 1. Follow these steps: Step 1: Find the GCF of 8 and 12. Factors of 8 - 1, 2, 4, 8 Factors of 12 - 1, 2, 3, 4, 6, 12 The GCF is 4 ----------Step 2: Divide the numerator & denominator by the GCF. 8 ÷ 4 12 ÷ 4 = 2 3 The GCF of 2 & 3 is 1.

Put these steps in your journal.

Find the GCF for each of these fractions and then express them in SIMPLEST FORM.

Use the 2-step process & don’t forget to think!!!

12
15

16
32

30
40

18
45

Do this in your journal --->

Find the Greatest Common Factor. 12: 1, 2, 3, 4, 6, 12 15: 1, 3, 5, 15 16: 1, 2, 4, 8, 16 32: 1, 2, 4, 8, 16, 32 30: 1, 2, 3, 5, 6, 10, 15, 30 GCF: 3 GCF: 16 GCF: 10

40: 1, 2, 4, 5, 8, 10, 20, 40
18: 1, 2, 3, 6, 9, 18 45: 1, 3, 5, 9, 15, 45

GCF: 9

Place these in your journal. Go to step 2------------------->

Divide the numerator & denominator by the GCF. 12 ÷ 3 = 4 15 ÷ 3 = 5 Simplest Form 4 5 Simplest Form

16 ÷ 16 = 1
32 ÷ 16 = 2 30 ÷ 10 = 3

1
2

Simplest Form

3

40 ÷ 10 = 4
18 ÷ 9 = 2 45 ÷ 9 = 5 Simplest Form

4
2 5

Is this what you got? Check your answers. ------->

Check Your Answers

12 = 4 15 = 5 16 = 1 32 = 2 30 = 3 40 = 4 18 = 2 45 = 5

Click Here


				
DOCUMENT INFO
Shared By:
Stats:
views:2912
posted:4/23/2008
language:English
pages:7