# Theorems on the Divisibility of Primes

As some have proposed, the division process might be sped up with divisibility criteria or tests. We can use rules to figure out which numbers can be split evenly. Realizing that there are only 2, 3, and 5 in that range, they realize their logic is simple. However, Rules 7, 11, and 13 are more complex and need more study. Students can improve their problem-solving ability by learning the divisibility tests and division rules for the numbers 1 through 20. Get the results you need by using The Divisible Calculator.

It’s no secret that many people struggle with maths. Attempting to solve a mathematical issue can be challenging, and it might be tempting to resort to quick or simple methods. As a result, evaluation outcomes will strengthen. Let’s take a look back at how division works in mathematics and go through some examples.

**Allocation based on Rule 1**

Any positive integer may be written as the sum of digits that split into one exactly. There are no restrictions on divisibility by 1 in the formula. A division by 1 always yields the same result, regardless of the size of the original integer.

**Division by Rule 2**

All integers divisible by two are even, including 2, 4, 6, 8, and 0.

An even number is 508, for instance. It’s thus divisible by 2, unlike the less exact 509.

There are a few techniques to determine if 508 is a divisor of 2:

This number is evenly divisible by two only if the last digit is an 8.

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**Division by Rule 3**

I have been using the number 308 to show how it works. You can find out if 308 is divisible by three by adding up the digits (3 + 0 + 8 = 11).

The initial integer is divisible by three when the capacity is a multiple of three. The number 308 is similar to 11, which is not divisible by 3.

The sum of its digits, 5+1+6=12, is a multiple of 3, making 516 a perfect square.

**Divisibility Criteria Rule 4**

A number is a multiple of 4 and divisible by four if its final two digits are divisible by 4.

So, for instance, think of the year 2304 as an example. Remember that the final two digits sum up to 8. Number 2308 itself is divisible by four, much like the number 8.

**Dividing by the Rule 5**

Five can be subdivided into any integer that ends in zero or five.

Examples of such numbers include 10, 10,000, 1,000,000, 1,595,000, 394, 000, 855 000, etc.

**Golden Law, Rule 6**

Six-digit numbers can be evenly split into parts 2, 3, and themselves. The number is a multiple of 6 if and only if the last digit is an even integer and the sum of the numbers is a multiple of 3.

Due to the zero as the final digit, 630 is divisible by 2 but no other whole numbers.

Nine is a number that may be divided by both three and itself. The numbers are 6, 3, and 0.

Reason enough to divide 630 by 6.

**Subdividing a Whole into Smaller Parts Rule 7**

Stick to these steps, and you’ll also quickly understand the 7-divide rule.

If you follow the rule, multiply the answer by 2, then subtract 3. Therefore the outcome is the number 6.

The result of subtracting 107 digits from a number is 1.

Another round of calculations yields the same result: 1 + 2 = 2.

Subtract two from 10, and you get 8.

The number 1073 is not divisible by 7 in the same way that 8 is not.

**Dividing By 8 Rule**

An integer is divisible by eight if and only if its last three digits can be split by 8.

Consider the case of the number 24344. Just like 344 is divisible by 8, so is the original 24344. Look at the last two digits, 344, and ignore the rest.

**Rule 9 of Divisible**

The rule for determining if a figure is divisible by 9 is the same as deciding whether a number is divisible by 3.

The sum of the digits in 78532, 25, is not divisible by nine; it is not a prime number.

**Divide-and-Conquer Rule 10**

Any whole integer that ends in zero is divisible by 10.

The numbers 10, 20, 30, 1,000, 5,000, 60,000, etc.