2, i think
If you're allowed to repeat factors, 2 x 2 x 2 x 2 = 16. If not, no number less than 100 has more than 3 distinct prime factors.
-2 is less than 2 -2 < 2
2 less than 4 is 2.
2/3 = 0.666..... and 3/4 = 0.75 so it follows that 2/3 is less than 3/4
2
4
Much less than 2 km. 9000 cm is no more than 300 feet.
2 is less than 3
2 is more than 1.
2 is less than 5.
4 is more than 2.
6 is more than 2.
8 is more than 2.
10 is more than 2.
12 is more than 2.
7 is more than 2.
15 is more than 2.