1000000000
A is a cube; B consists of 1000 cubes the size of cube A, C consists of 1000 cubes the size of cube B; and D consists of 1000 cubes the size of cube C. Thus there are 1 million A-sized cubes in C; and 1,000,000,000 A-sized cubes in D.
10 inches is 15,783マイル (25,400 km), more than halfway around the world and thus sufficient to reach any point on the globe from any other point.
10 metres (called a gigametre) is almost three times the distance from the Earth to the Moon.
10 kilometres (called a terametre) is over six times the distance from the Earth to the Sun.
(10 days is roughly 2.738 million years.)
About 10 months ago, dinosaurs walked the Earth during the late Cretaceous. (10 months is roughly 83.3 million years.)
About 10 years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth.
About 10 decades ago, galaxies began to appear in the early Universe which was then 3.772 billion years old. (10 decades is exactly 10 billion years.)
The universe is thought to be about 13.77 × 10 years old.