Divisibility Rule of 644

The divisibility rule for 644 is a method by which we can find out if a number is divisible by 644 or not without using the division method. Check whether 2576 is divisible by 644 with the divisibility rule.

Step 1: Divide the number into groups of three digits from the right. In 2576, the last group would be 576 and the remaining digits are 2.

Step 2: Multiply the group of three digits by 16, then add the result to the remaining digits. 576 × 16 = 9216; add 9216 to 2, resulting in 9218.

Step 3: Check if the result from Step 2 is a multiple of 644. If it is, the number is divisible by 644. If not, the number isn't divisible by 644.

Learning the divisibility rule will help kids to master division. Let’s learn a few tips and tricks for the divisibility rule of 644.

• Know the multiples of 644: Memorize the multiples of 644 (644, 1288, 1932, etc.) to quickly check the divisibility. If the result from the addition is a multiple of 644, then the number is divisible by 644.

• Repeat the process for large numbers: Students should keep repeating the divisibility process until they reach a small number that is divisible by 644.
  
  For example, check if 12888 is divisible by 644 using the divisibility test. Divide into groups: 888 and 12. Multiply 888 by 16, 888 × 16 = 14208; add 14208 to 12, resulting in 14220.
  
  Repeat the process for 14220: Divide into groups: 220 and 14. Multiply 220 by 16, 220 × 16 = 3520; add 3520 to 14, resulting in 3534. Since 3534 is not a multiple of 644, 12888 is not divisible by 644.

• Use the division method to verify: Students can use the division method as a way to verify and cross-check their results. This will help them to verify and also learn.

• Divisibility rule: The set of rules used to find out whether a number is divisible by another number or not.

• Multiples: Multiples are the results we get after multiplying a number by an integer. For example, multiples of 644 are 644, 1288, 1932, etc.

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

• Grouping: The process of dividing a number into smaller parts or groups for easier calculations, especially in divisibility rules.

• Addition: The mathematical process of finding the total or sum by combining two or more numbers.