16/21 is greater than 13/18.
Answer:
0.1
Step-by-step explanation:
4 x 10^-3 = 0.004
4 x 10^-4 = 0.0004
0.0004 ÷ 0.004 = 0.1
1 /320 inches
thickness of each card
7/8 ÷ 280
7/8 x 1/280 = 1/320 in