When do spell out a number?

What is 5.008 rounded to the nearest tenth? Is 18 prime or composite number? Which state is the pentagon in? What is the condition for no solution of linear equation? Why do we need bidmas? How do you simplify 12 over 49? What is the square root of 361 plus the square root of 529? How do you write 16 25 as a percentage? If you paid 160 for a camera after receiving a discount of 20 percent what was the price of the camera before the discount? How many months are in a century? What is the equivalent of 12 divided by 25? How does the alpheabet go? How many times is the word today written in the Bible? What is 104 in 2 significant figures? What is 10ft 0 inches by 12ft 6 inches in square feet? How many miles is 206 km? Is 37 a prime or composite? What kind of bond angle is so3? How many feet in 2.75 miles? What is 73 rounded to the nearest hundredth?