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Earn +20 ptsQ: What are all of the prime factors of 840?
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What are the longest factor string for 840 and explain why?
The longest factor string for 840 is its prime factorization because prime factors can't be broken down any further.
How do find the prime factorization of 840?
Find one factor, divide by it to get the other factor. Continue separating each of the factors into smaller factors, until you only have prime numbers. For example, 840 = 2 x 420. Now continue finding smaller factors for 420.
What are Five factor strings for 840?
2 x 420 3 x 280 4 x 210 5 x 168 6 x 140
What is the LCM of 21 and 40 how to solve it?
Prime factors of 21 are: 3 and 7 Prime factors of 40 are: 23 and 5 LCM = 23*3*5*7 = 840
How do you know when you have found the longest factor string for 840?
You will know because all of the numbers are prime.
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