Divisibility Rule of 40

The divisibility rule for 40 is a method by which we can find out if a number is divisible by 40 or not without using the division method. A number is divisible by 40 if it is divisible by both 5 and 8. Check whether 320 is divisible by 40 with the divisibility rule.

Step 1: Check divisibility by 5. A number is divisible by 5 if its last digit is 0 or 5. In 320, the last digit is 0, so 320 is divisible by 5.

Step 2: Check divisibility by 8. A number is divisible by 8 if the last three digits form a number that is divisible by 8. In 320, the last three digits form the number 320, which is divisible by 8 (320 ÷ 8 = 40).

Step 3: Since 320 is divisible by both 5 and 8, it is divisible by 40.
 

Learning the divisibility rule will help kids master division. Let’s learn a few tips and tricks for the divisibility rule of 40.

• Know the multiples of 40: Memorize the multiples of 40 (40, 80, 120, 160, etc.) to quickly check divisibility.
   
• Check divisibility by 5 and 8: Ensure the number meets the criteria for divisibility by both 5 and 8.
   
• 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: A set of rules used to find out whether a number is divisible by another number without direct division.
   
• Multiples: The results obtained by multiplying a number by an integer. For example, multiples of 40 are 40, 80, 120, 160, etc.
   
• Integers: Numbers that include all whole numbers, negative numbers, and zero.
   
• Divisible: A number is divisible by another if it can be evenly divided without a remainder.
   
• Verification: The process of confirming results by cross-checking using alternative methods, such as actual division.