210
840 and 70, respectively.
25% is a quarter of 840: 840 ÷ 4 = 210
420 - 210 = 210 630 - 420 = 210 840 - 630 = 210
The LCM is 840.
210
25% of 840 is 210
210 and 420 have a GCF of 210.
Since 210 is a factor of 420, it is automatically the GCF.
The GCF is 6.
The GCF is 120.
840
210