HIGHEST COMMON FACTOR • LOWEST COMMON MULTIPLE • ENTER • NO SCROLL

NUMBER A

ACTIVE

NUMBER B

TAP

HCF

AUTO

LCM

AUTO

METHOD

EUCLID

ENTER computes HCF first, then LCM = (A×B) ÷ HCF

WORKING

READY

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PAGE SUMMARY

Fast HCF calculator

Fast LCM calculator

P627 HCF & LCM: enter A and B • ENTER computes • extra pages for help and searches

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EXAMPLE

12 and 18 → HCF 6 • LCM 36

Use the remainder method to reach the last non-zero remainder.

HISTORY

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HOW TO USE

Type the first whole number into NUMBER A

Type the second whole number into NUMBER B

Press ENTER or CALCULATE

Read the HCF and LCM boxes plus the working

WHAT HCF MEANS

Highest common factor

Greatest common factor

Greatest common divisor

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MATHS HELP

Euclid algorithm uses repeated remainders

When remainder becomes zero, the last divisor is the HCF

LCM comes from multiplying then dividing by the HCF

COMMON USES

simplifying fractions

simplifying ratios

finding common denominators

number theory homework

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