logo
g Text Version
Beauty & Self
Books & Music
Career
Computers
Education
Family
Food & Wine
Health & Fitness
Hobbies & Crafts
Home & Garden
Money
News & Politics
Relationships
Religion & Spirituality
Sports
Travel & Culture
TV & Movies

dailyclick
Bored? Games!
Nutrition
Postcards
Take a Quiz
Rate My Photo

new
European Travel
Action Movies
Bible Basics
Houseplants
Romance Movies
Creativity
Family Travel


dailyclick
All times in EST

Autism Spectrum Disorders: 4:00 PM

Full Schedule
g
g Math Site

BellaOnline's Math Editor

g

Multiplication - Unique Timetable Patterns - 5s


After the basic concepts of multiplication have been taught, here are some tips to learning and memorizing multiplication facts for 5s. The five timetables are generally easily learned, but here are some patterns that may help some struggling students.

5s ----- Use skip counting to learn the 5s. For instance, to calculate 5 x 4, count by 5s four times5, 10, 15, 20. Therefore, 5 x 4 = 20.

Another consideration especially for older students: Take a look at the 2nd factor in the 5 timetables and the answer (product). Do you see a pattern?
5 x 1 = 05 (odd)
5 x 2 = 10 (even)
5 x 3 = 15 (odd)
5 x 4 = 20 (even)
5 x 5 = 25 (odd)
5 x 6 =30 (even) and so on

Multiplying 5 by an EVEN factor: The first digit in the product is half of the 2nd factor without a remainder or with nothing left over. So, the second digit in the answer is 0.
Example, 5 x 4 = 20 --- two is half of 4; add a zero behind it. By the way, half of a number is the same as dividing by 2.

Will this work for 5 x 8 ? Half of 8 is 4; add a zero to the end --- 5 x 8 = 40. Count by 5s eight times to check for accuracy. 5, 10, 15, 20, 25, 30, 35, 40. Yes! It works!

Multiplying 5 by an Odd factor: Odd numbers dont divide in half evenly. There will be a remainder. So, subtract 1 to get an even number; then take half. Next, add a 5 behind the number. Ill tell you why later.

Example: 5 x 3
Step 1 subtract 1 from 3 (3-1=2)
Step 2 -- Take half of two (1)
Step 3 -- Add a five behind the 1 (15)
5 x 3 = 15

Another example: 5 x 7
Step 1 subtract 1 from 7--- (7 1 = 6)
Step 2 -- Take half of six --- (3)
Step 3 -- Add a five behind the 3--- (35)
5 x 7 = 35

Note: Im able to remember to add a 5 behind the number because I noticed another pattern. If I imagine a decimal between the digits of the product, the result is exactly half of the number being multiplied by 5. Check it out with a calculator for 5 x 7! Enter 7 / 2 ; the result is 3.5 Hmmm, 5 x 7 = 35
Have fun testing the others.

****Remember the COMMUTATIVE PROPERTY the order of the numbers does not change the answer. One fact learned means that two facts are actually learned.
Example: 4 x 5 = 20 and 5 x 4 = 20

If you would like an interactive learning tool, consider Hot Dots Multiplication Flash Cards. A special pen is used to select an answer. A correct answer will produce a bright light and sound, and a wrong answer gives a bong sound. This is the version I used in my class without any groans. However, now there is a new and improved pen with new sound effects, lights, and it talks. . Keep in mind, the pen is sold separately, and you can choose whether you want to hear words and/or sounds on the pen. Thats good to know for a classroom setting.



Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Twitter Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Facebook Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to MySpace Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Del.icio.us Digg Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Yahoo My Web Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Google Bookmarks Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Stumbleupon Add Multiplication+%2D+Unique+Timetable+Patterns+%2D+5s to Reddit




Multiplication Facts - Nine Timetables
Multiplication - Multiples and Powers of Ten
RSS
Related Articles
Editor's Picks Articles
Top Ten Articles
Previous Features
Site Map


For FREE email updates, subscribe to the Math Newsletter


Past Issues


print
Printer Friendly
bookmark
Bookmark
tell friend
Tell a Friend
forum
Forum
email
Email Editor


Content copyright © 2014 by Beverly Mackie. All rights reserved.
This content was written by Beverly Mackie. If you wish to use this content in any manner, you need written permission. Contact Beverly Mackie for details.

g


g features
Travel Games

Math MOOC - Free Online Math Courses - Self-Paced

Interactive App for Student Engagement

Archives | Site Map

forum
Forum
email
Contact

Past Issues
memberscenter


vote
Poetry
Daily
Weekly
Monthly
Less than Monthly



BellaOnline on Facebook
g


| About BellaOnline | Privacy Policy | Advertising | Become an Editor |
Website copyright © 2014 Minerva WebWorks LLC. All rights reserved.


BellaOnline Editor