![]() |
|
||||
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
|
Subscribe to Homeschool Math Newsletter - filled with math teaching information February 2010 newsletter
Latest from my blog This is where you'll find the latest happenings, news, & ideas in math teaching Math teaching videos My videos at YouTube show you how to teach concepts.
Divide decimals - why do we move the decimal point?
Hover your mouse above to open a menu of various worksheets you can generate for free! Advice, reviews, and resources to help you choose a math curriculum! Games you can play online, interactive tutorials, fun math websites and more. Arranged by topic/level for ease of use. Learn how to TEACH concepts or about general concerns in math education. Reviews In-depth reviews of math products Math help & tutoring A list of free message boards, math help websites, and online tutoring services. My Amazon Store See some math products I recommend. I have two games on my site, plus links to many. |
The ideas in this lesson are taken from Multiplication Division 3 ebook. Only a few examples of each problem type are shown; you should make more problems of each kind for the student. Divisibility rules
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Numbers that are
divisible by 2 end in __, __, __, __, or __.
Numbers that are divisible by 5 end in either __ or __. Numbers that are divisible by 10 end in __ . |
Division rule for 3 is different. No longer do we check in what the
number ends:
In other words, we add the digits of the number, and if that is divisible
by 3, so is the original number.
|
1. Check if these numbers are divisible by three. Then divide the number by 3 in your notebook and record the answer here. What is the remainder if the number IS divisible by 3?
| Number | sum of its digits |
divisible by 3 |
division result |
| 771
8096 2304 |
771 ÷
3 = ___, R ___
8096 ÷ 3 = ___, R ___ 2304 ÷ 3 = ___, R ___ |
Division rule for 9 is similar to the division rule for 3.
|
2. Check if these numbers are divisible by nine. Then divide the number by 9 in your notebook and record the answer here. What is the remainder if the number IS divisible by 9?
| Number | sum of its digits |
divisible by 9 |
division result |
| 771
1000 333 |
771 ÷
9 = ___, R ___
1000 ÷ 9 = ___, R ___ 333 ÷ 9 = ___, R ___ |
3. Use the divisibility rules and check if the number is divisible by 2, 3, 5, or 9.
| divisible by | divisible by | |||||||||
| Number | 2 | 3 | 5 | 9 | Number | 2 | 3 | 5 | 9 | |
| 238
6095 |
477
5770 |
|||||||||
Division rule for 6 says
|
4. Check if these numbers are divisible by six. If it is, then divide the number by 6 in your notebook and record the answer here.
| Number |
divisible by 6 |
division result |
| 771
8196 1000 |
771 ÷
6 = ___, R ___
8196 ÷ 6 = ___, R ___ 1000 ÷ 6 = ___, R ___ |
5. a) Find two numbers that are divisible by both 10 and 3.
b) Find two numbers that are divisible by both 2 and 9.
continue to factoring
|
|
|
Copyright 2003-2010 Maria Miller
http://www.homeschoolmath.net/
| 24K Gold Music Shows - 50s 60s oldies music show
Performing 100s of songs of the popular artists from the oldies era. They are my favorites! Check them out! ~ Maria Miller | ||
![]()
|
![]()
|
|