140
7 is the number that can go into both 35 and 49.
140 28 x 5 = 140 = 35 x 4
315
4 because 35+35=70+35=105+35=140
1 and 7 both can.
1 and 5.
35
28 35.
The only number that can go into both numbers is 5
1 x 140, 2 x 70, 4 x 35, 5 x 28, 7 x 20, 10 x 14.
35 70 105 140 etc 3 x 35 = 105 with 8 remaining