Last updated on May 26th, 2025
The divisibility rule is a way to determine whether a number is divisible by another number without performing actual division. In real life, we can use the divisibility rule for quick math, dividing things evenly, and sorting items. In this topic, we will learn about the divisibility rule of 79.
The divisibility rule for 79 is a method to find out if a number is divisible by 79 without using division. Check whether 6321 is divisible by 79 using the divisibility rule.
Step 1: Multiply the last digit of the number by 23, here in 6321, 1 is the last digit. Multiply it by 23. 1 × 23 = 23.
Step 2: Subtract the result from Step 1 from the remaining number without the last digit. i.e., 632–23 = 609.
Step 3: Check if 609 is a multiple of 79. Since it is not, 6321 is not divisible by 79. If the result from step 2 is a multiple of 79, then the number is divisible by 79.
Learning the divisibility rule helps kids master division. Let’s learn a few tips and tricks for the divisibility rule of 79.
Memorize the multiples of 79 (79, 158, 237, etc.) to quickly check divisibility. If the result from the subtraction is a multiple of 79, then the number is divisible by 79.
If the result after subtraction is negative, ignore the negative sign and consider it as positive for checking divisibility.
Students should keep repeating the divisibility process until they reach a small number that can be checked for divisibility by 79.
For example: Check if 15842 is divisible by 79 using the divisibility test. Multiply the last digit by 23, i.e., 2 × 23 = 46.
Subtract 46 from the remaining digits, excluding the last digit: 1584–46 = 1538.
Repeat the process: 8 × 23 = 184. Subtract 184 from the remaining digits, excluding the last digit: 153–184 = -31.
Since -31 is not a multiple of 79, 15842 is not divisible by 79.
Students can use the division method to verify and cross-check their results. This will help them confirm their understanding.
The divisibility rule of 79 helps us quickly check if a given number is divisible by 79, but common mistakes like calculation errors can lead to incorrect conclusions. Here we will identify some common mistakes and how to avoid them.
Is 5531 divisible by 79?
Yes, 5531 is divisible by 79.
To check if 5531 is divisible by 79, use the following steps:
1) Double the last digit of the number, 1 × 2 = 2.
2) Subtract this from the remaining number, 553 - 2 = 551.
3) Check if 551 is a multiple of 79. Yes, 551 is a multiple of 79 (79 × 7 = 553)
Check the divisibility rule of 79 for 6329.
No, 6329 is not divisible by 79.
To determine if 6329 is divisible by 79, follow these steps:
1) Double the last digit, 9 × 2 = 18.
2) Subtract this from the remaining number, 632 - 18 = 614.
3) Check if 614 is a multiple of 79. No, 614 is not a multiple of 79.
Is 1581 divisible by 79?
Yes, 1581 is divisible by 79.
To verify if 1581 is divisible by 79, proceed as follows:
1) Double the last digit, 1 × 2 = 2.
2) Subtract this from the remaining number, 158 - 2 = 156.
3) Check if 156 is a multiple of 79. Yes, 156 is a multiple of 79 (79 × 2 = 158).
Can 1987 be divisible by 79 following the divisibility rule?
o, 1987 is not divisible by 79.
To check if 1987 is divisible by 79, follow these steps:
1) Double the last digit, 7 × 2 = 14.
2) Subtract this from the remaining number, 198 - 14 = 184.
3) Check if 184 is a multiple of 79. No, 184 is not a multiple of 79.
Check the divisibility rule of 79 for 3952.
Yes, 3952 is divisible by 79.
To confirm if 3952 is divisible by 79, use the following steps:
1) Double the last digit, 2 × 2 = 4.
2) Subtract this from the remaining number, 395 - 4 = 391.
3) Check if 391 is a multiple of 79. Yes, 391 is a multiple of 79 (79 × 5 = 395).
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
: She loves to read number jokes and games.