How many multiples is 27720? Let’s learn Divisibility rule.
a | b is an expression that b is divisible by a.
All natural numbers are multiples of 1.
You can find out the divisibility of 2 just by looking at the number of ones digits.
If the last digit is 0, 2, 4, 6, or 8, it is a multiple of 2.
When we see an even number, we can intuitively know that it is a multiple of 2.
Here, the ones digit is 0, so of course it is a multiple of 2.
You can know that a number is a multiple of 3 because the sum of each digit is a multiple of 3.
Since the sum of each digit is 18, it is a multiple of 3.
Also, for multiples of 9, look at the sum of each digit.
Since the sum of each digit is 18, it is a multiple of 9.
For multiples of 4, look at the last two digits. Since it is 20, it is a multiple of 4.
00,04,08,12,16,20,24...,96 If it is written like this, it is a multiple of 4.
Multiples of 5 only look at the ones digit. There are only two: 0 and 5.
Since 2 and 5 make 10, you only need to look at the single digit at the end.
4 and 25 make 100. Of course, just look at the two digits at the end.
8 and 125 make 1000, so just look at the three digits at the end, right?
If you look at the three digits at the end, the multiple of 8 is 720! Since 720 is a multiple of 8, 27720 is also a multiple of 8.
If the sum of alternately adding and subtracting the digits of a number is a multiple of 11,
then the original number is also a multiple of 11.
Determining multiples of 7 is not quick, but can be determined by gradually reducing the number of digits.
Multiply the last digit by 5 and add it to the previous numbers to determine whether it is a multiple of 7.
If you repeat this process, the number of digits gradually decreases, making it easier to check if it is a multiple of 7.
Called Spence's method, multiply the last digit by 2 and then find the difference between the previous numbers.
There is also a way to reduce the number of digits by multiplying by 9
and finding the difference from the previous numbers.
It's all explained here, but if you prefer videos rather than text, the YouTube link is below.
Divisibilityrule link
#Howtodeterminemultiples #Multipleof7 #Multipleof11