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Product rule (two numbers)
HCF × LCM = a × b
Where: HCF = HCF, LCM = LCM, a = first number, b = second number
Solved example
Given: LCM_ = 7, a = 5, b = 10
Find: HCF_ (HCF)
- Formula: HCF·LCM = a·b
- Rearranged for HCF: HCF = a·b/LCM
- Substitute the values: HCF = 10·5/7
- Result: HCF = 7.142857
Answer: HCF_ = 7.142857
Calculator
How to calculate Product rule (two numbers)
- Write down the formula: HCF × LCM = a × b.
- Note the known values (LCM, a, b).
- Substitute them and simplify to find HCF_.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Product rule (two numbers)?
The formula is HCF × LCM = a × b, where HCF = HCF, LCM = LCM, a = first number, b = second number.
What is Product rule (two numbers) when LCM_ = 7, a = 5, b = 10?
HCF_ = 7.142857. Substitute the values into HCF × LCM = a × b and simplify.