Respuesta :
To get the Greates Common Factor (GCF) of 21 and 40 we need to factor each value first and then we choose all the copies of factors and multiply them:
21: 3 740: 222 5 GCF: The Greates Common Factor (GCF) is: 1
21: 3 740: 222 5 GCF: The Greates Common Factor (GCF) is: 1