The product of 1/2 and another factor is less than 1/2. which could be the other factor? 4/3 4/2 5/2 3/4

The factor is 3/4.

1/2 x 3/4 = 3/8

To find out which fractions is bigger, you need to make the different denominators the same.
2x4= 8 and 1x4=4

3/8<4/8

1+1=22×1=22-1=11-1=1duh