Tests Of Divisibility
Chapter Name : Playing With Numbers |
Sub Topic Code : 104_08_16_05_03 |
Topic Name : Tests Of Divisibility |
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Sub Topic Name : Divisibility By 9 And 3 |
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Introduction
Divisibility by 9 and 3.
Pre-Requisites:
Basic knowledge of divisor and multiple.
Activity:
Write down random numbers and you can observe that any number whose sum of digits is a multiple of 9 then the number is divisible by 9.
Real Life Question:
If a number divisible by 9 , is it divisible by 3?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Divisibility by 3 Divisibility by 9 | If the sum of digits of the number is divisible by 3 then the number is divisible by 3 If the sum of digits of the number is divisible by 9 then the number is divisible by 9 |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Divisibility by 9 test | Given a number find whether it is divisible by 9 or not. |
Real life uses :
If Rs 27 for 9 bananas then , how much is each banana?
Practical examples around us
| Examples | Explainations |
|---|---|
| Is an integer an answer when 8541 is divided by 9 | 8+5+4+1 =18 which is 2*9, therefore 8541 is divisible by 9.So we get an integer. |
What you learn in Theory:
Divisibility by 9 and 3
What you learn in Practice:
Divisibility