Respuesta :

TSO
list the factors:

21: 1, 3, 7, 21
40: 1, 2, 4, 5, 8, 10, 20, 40

They only have 1 in common.

So 1 is the greatest common factor.
hhend001

Answer:

1

Step-by-step explanation:

you can just right down the multiples of both of the numbers then you will find the right answer

Relax

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