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Factors of 490: As Taught by a Math Tutor
Methods
What are the Factors of 490?
As your math tutor, I’m here to guide you through the different types of factors of 490. Understanding factors is key to mastering multiplication, division, and prime numbers. Here’s a breakdown:
• Factors of 490: 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490
• Sum of Factors of 490: 1026
• Negative Factors of 490: -1, -2, -5, -7, -10, -14, -35, -49, -70, -98, -245, -490
• Prime Factors of 490: 2, 5, 7
• Prime Factorization of 490: 2^1 × 5^1 × 7^2
There are two main ways a math tutor would explain how to find the factors of 490: using factor pairs and prime factorization. Let’s explore both!
The Factor Pairs of 490
As your math tutor, I’m here to help you break down factor pairs of 490 step by step!
Factor pairs of 490 are any two numbers that, when multiplied together, equal 490. The question to ask is “what two numbers multiplied together equal 490?” Every factor can be paired with another factor, and multiplying the two will result in 490.
To find the factor pairs of 490, follow these steps:
Step 1:
Find the smallest prime number that is larger than 1, and is a factor of 490. For reference, the first prime numbers to check are 2, 3, 5, 7, 11, and 13. In this case, the smallest factor that’s a prime number larger than 1 is 2.
Step 2:
Divide 490 by the smallest prime factor, in this case, 2:
490 ÷ 2 = 245
2 and 245 will make a new factor pair.
Step 3:
Repeat Steps 1 and 2, using 245 as the new focus. Find the smallest prime factor that isn’t 1, and divide 245 by that number. In this case, 5 is the new smallest prime factor:
245 ÷ 5 = 49
Remember that this new factor pair is only for the factors of 245, not 490. So, to finish the factor pair for 490, you’d multiply 2 and 5 before pairing with 49:
2 x 5 = 10
Step 4:
Repeat this process until there are no longer any prime factors larger than one to divide by. At the end, you should have the full list of factor pairs.
Here are all the factor pairs for 490:
(1, 490), (2, 245), (5, 98), (7, 70), (10, 49), (14, 35)
So, to list all the factors of 490: 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490
The negative factors of 490 would be: -1, -2, -5, -7, -10, -14, -35, -49, -70, -98, -245, -490
Now you’ve got it! A math tutor would always encourage you to practice with different numbers to reinforce your understanding of factor pairs. Try another one!
Prime Factorization of 490
To find the prime factorization of 490, we break it down step by step until only prime factors remain. Then, we express 490 as a product of these prime factors multiplied together. Let’s go through the process and simplify it like a math tutor would!
The process of finding the prime factorization of 490 only has a few differences from the above method of finding the factors of 490. Instead of ensuring we find the right factor pairs, we continue to factor each step until we are left with only the list of smallest prime factors greater than 1.
Here are the steps for finding the prime factorization of 490:
Step 1:
Find the smallest prime number that is larger than 1, and is a factor of 490. For reference, the first prime numbers to check are 2, 3, 5, 7, 11, and 13. In this case, the smallest factor that’s a prime number larger than 1 is 2.
Step 2:
Divide 490 by the smallest prime factor, in this case, 2
490 ÷ 2 = 245
2 becomes the first number in our prime factorization.
Step 3:
Repeat Steps 1 and 2, using 245 as the new focus. Find the smallest prime factor that isn’t 1, and divide 245 by that number. The smallest prime factor you pick for 245 will then be the next prime factor. If you keep repeating this process, there will be a point where there will be no more prime factors left, which leaves you with the prime factors for prime factorization.
So, the unique prime factors of 490 are: 2, 5, 7
Math Tutor Suggests: Find the Factors of Other Numbers
Practice your factoring skills by exploring how to factor other numbers, like the ones below:
Factors of 51 - The factors of 51 are 1, 3, 17, 51
Factors of 28 - The factors of 28 are 1, 2, 4, 7, 14, 28
Factors of 115 - The factors of 115 are 1, 5, 23, 115
Factors of 21 - The factors of 21 are 1, 3, 7, 21
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