1. Check whether 5500 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 5500 is 0, which is divisible by 4.
`:.` 5500 is divisible by 4.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 5500 is 0, which is divisible by 5.
`:.` 5500 is divisible by 5.
5500 is divisible by 4 and 5.
`:.` 5500 is divisible by 20.
2. Check whether 6680 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 6680 is 80, which is divisible by 4.
`:.` 6680 is divisible by 4.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 6680 is 0, which is divisible by 5.
`:.` 6680 is divisible by 5.
6680 is divisible by 4 and 5.
`:.` 6680 is divisible by 20.
3. Check whether 7180 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 7180 is 80, which is divisible by 4.
`:.` 7180 is divisible by 4.
Divisibility rule of 5 :
The last digit is 0 or 5, then number is also divisible by 5.
Last digit of 7180 is 0, which is divisible by 5.
`:.` 7180 is divisible by 5.
7180 is divisible by 4 and 5.
`:.` 7180 is divisible by 20.
4. Check whether 5319 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 5319 is 19, which is not divisible by 4.
`:.` 5319 is not divisible by 4.
Hence 5319 is also not divisible by 20.
5. Check whether 6857 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 6857 is 57, which is not divisible by 4.
`:.` 6857 is not divisible by 4.
Hence 6857 is also not divisible by 20.
6. Check whether 7234 is divisible by 20 or not?Solution:Divisibility rule of 20 :
If number is divisible by 4 and 5, then number is also divisible by 20.
Divisibility rule of 4 :
The last two digit is divisible by 4, then number is also divisible by 4.
Last 2 digit of 7234 is 34, which is not divisible by 4.
`:.` 7234 is not divisible by 4.
Hence 7234 is also not divisible by 20.
This material is intended as a summary. Use your textbook for detail explanation.
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