Divisibility Rule of 321

The divisibility rule for 321 is a method by which we can find out if a number is divisible by 321 or not without using the division method. Check whether 642 is divisible by 321 with the divisibility rule.

Step 1: Break the number into groups of three digits starting from the right. Here, 642 is already a three-digit number.

Step 2: Check if each group of three digits forms a number that is divisible by 321. If yes, then the entire number is divisible by 321.

Here, 642 ÷ 321 = 2 with no remainder, so 642 is divisible by 321.

Learning the divisibility rule will help kids master division. Let’s learn a few tips and tricks for the divisibility rule of 321.

Know the multiples of 321:

 Memorize the multiples of 321 (321, 642, 963, etc.) to quickly check divisibility. If the number formed by a group of three digits is a multiple of 321, then the entire number is divisible by 321.

Break down larger numbers:

 For larger numbers, break them into groups of three digits from right to left. Check each group separately for divisibility by 321.

Use the division method to verify:

 Students can use the division method as a way to verify and crosscheck their results. This will help them confirm and also learn.

• Divisibility rule: The set of rules used to find out whether a number is divisible by another number or not. For example, a number is divisible by 321 if each group of three digits is divisible by 321.

• Multiples: Multiples are the results we get after multiplying a number by an integer. For example, multiples of 321 are 321, 642, 963, etc.

• Integers: Integers are the numbers that include all the whole numbers, negative numbers, and zero.

• Grouping: Grouping is the process of dividing a number into parts, such as groups of three digits, for the purpose of applying a divisibility rule.

• Verification: Verification involves using alternative methods, like division, to confirm the results obtained from a divisibility rule.