Which is the greatest common factor of 16 and 40? a- 4 b- 8 c- 40 d- 80

8 because it's the highest number that can go into both numbers evenly.

16 = 4*4 = 2*2*2*2 
40= 5*8 = 5*2*2*2

2*2*2 = 8 is the common part of 16 and 40, so 8 is the greatest common factor of 16 and 40.

Answer is B. 8.

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.