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The common multiples of 21 and 28 are 84, 168, 252, 336, ... and so on, never ending; so there is no real Highest Common Multiple.
Do you mean:
- Highest Common Factor - the highest number which divides both 21 and 28 which is 7; or
- Lowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.
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Earn +20 ptsQ: What is the HCM of 21 and 28?
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Continue Learning about Math & Arithmetic
What is the hcm of 50 and 60?
Hcm of 50 and 60= 2
What is the answer to this question two numbers have a lcm of 24 and a hcm of 2 what is the answer?
This question as written has no rational answer since the value of an hcm, being infinite, is unquantifiable. If you change the hcm to GCF, you could use 6 and 8 or 24 and 2.
What is 21 to 28 in simplest form?
21/28 = 3/4
What is 21 divide by 28?
1.3333
What is 21 over 28 equal to?
21/28 = 3/4 or 0.75
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