well i would say 0 because lots of numbers have 0s on the end and also you would normally round things up to the nearest 10.
One.
English - by number of countries, Chinese by number of speakers.
Mandarin has the most number of native speakers, but English is the most widely used langague in the world.
base-10 number system
Arabic
The most 'popular' number in the world has not been recorded.
Sachin Tendulkar has played the most number of World Cup matches.
Celsius is the temperature scale that is used in most of the world.
The Hindo-Arabic number system is the most widely used in the world today.
Youtube is the most used website in the world
The most common number used is 1
The tenth number is ten. The number ten is the tenth digit in the numbering system that is used in most of the world. This number is also the second place in a series of numbers beginning with the ones followed by the tens and hundreds.
Mandarin has the most number of native speakers owing to the large population of China. English is the most used language in the world as its taught in almost all public schools as a second or third language. Also almost 50 countries have English as their lingua-franca.