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birthday cake GCF and LCM

Find GCf Using Birthday

Lets find the GCF for 18 21 with Birthday Cake method

place numbers like so and because 3 goes into 21 and 18 AND is a prime number you put it there

How many times does 3 go into 21 and 18

now add another layer to the "cake" and put the only other prime number that goes into 7 and 9...1

1 goes into it 1 time circle 3 and 1

now multiply and theres your GCF