21000000000
14 over 21 written in simplest form is 2/3
63,021,002
15,021,000
The number 21 can be written as 2.10 × 101
21. You put them in numerical order and then find the center one.
twenty-one hundredths
7/12
21/40
121 is already in the simplest form. It can be written as 0.047619 in decimal form (rounded to 6 decimal places).
1.75
8
21 million in figures is 21,000,000 In scientific notation it is 2.1 x 10^(7)