Large distances are also measured in light years. One light year is about $9,460,000,000,000 \mathrm{km}$. It is the distance light travels in a year. If this distance can be expressed in scientific notation as $9.46\times {10}^a \mathrm{km}$, then find the value of $a$.

Write the number $6\times {10}^5$ in usual form. [Write the number without commas]

Write the number $7.4\times {10}^3$ in standard form.

Write the number $8.9\times {10}^7$ in standard form.

Voyager II flew an indirect course of about $2.3\times {10}^{ 9} \mathrm{km}$ to reach Saturn. Express the statement in standard form.

The diameter of Saturn's largest ring is about $4.8\times {10}^5 \mathrm{km}$. Express $4.8\times {10}^5$ in usual form, without commas.

Every hour a cell divides into $2$ cells. Which expression represents the number of cells after $5$ hours?

$\left(a\right)2^5$     $\left(b\right)5^2$       $\left(c\right)2\times 5$         $\left(d\right)2÷5$

A certificate of pedigree lists a dogs parents, grandparents and so on. The power $2^6$ describes the number of great-great-great-great grandparents a dog has. How many is this?

The sun is the centre of our solar system. The sun is the star closest to our planet. The surface temperature of the sun is close to $10,000°\mathrm{F}$. Write $10,000$ using exponents.