1. Check whether 21520 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 21520 is 1520, which is divisible by 16.
`:.` 21520 is divisible by 16.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 21520 is 0, which is divisible by 5.
`:.` 21520 is divisible by 5.
21520 is divisible by 16 and 5.
`:.` 21520 is divisible by 80.
2. Check whether 24400 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 24400 is 4400, which is divisible by 16.
`:.` 24400 is divisible by 16.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 24400 is 0, which is divisible by 5.
`:.` 24400 is divisible by 5.
24400 is divisible by 16 and 5.
`:.` 24400 is divisible by 80.
3. Check whether 30640 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 30640 is 640, which is divisible by 16.
`:.` 30640 is divisible by 16.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 30640 is 0, which is divisible by 5.
`:.` 30640 is divisible by 5.
30640 is divisible by 16 and 5.
`:.` 30640 is divisible by 80.
4. Check whether 23444 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 23444 is 3444, which is not divisible by 16.
`:.` 23444 is not divisible by 16.
Hence 23444 is also not divisible by 80.
5. Check whether 26627 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 26627 is 6627, which is not divisible by 16.
`:.` 26627 is not divisible by 16.
Hence 26627 is also not divisible by 80.
6. Check whether 31741 is divisible by 80 or not?Solution:Divisibility rule of 80 :
If number is divisible by 16 and 5, then number is also divisible by 80.
Divisibility rule of 16 :
The last four digit is divisible by 16, then number is also divisible by 16.
Last 4 digit of 31741 is 1741, which is not divisible by 16.
`:.` 31741 is not divisible by 16.
Hence 31741 is also not divisible by 80.
This material is intended as a summary. Use your textbook for detail explanation.
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