answersLogoWhite

0


Best Answer

First you express the numbers as the product of their prime factors:

28 = 2x2x7

21 = 3x7

Next you find the HCF. In this case, the HCF is 7. Finally, you multiply the numbers together and divide by the HCF. 28x21/7 = 84

Therefore the LCM of 28 and 21 is 84.

User Avatar

Wiki User

โˆ™ 2012-02-26 16:04:14
This answer is:
User Avatar
Study guides

Algebra

20 cards

A polynomial of degree zero is a constant term

The grouping method of factoring can still be used when only some of the terms share a common factor A True B False

The sum or difference of p and q is the of the x-term in the trinomial

A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

โžก๏ธ
See all cards
3.75
โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…
1050 Reviews

Add your answer:

Earn +20 pts
Q: How do you find LCM of 28 and 21?
Write your answer...
Submit
Still have questions?
magnify glass
imp
People also asked