How many thousands make a million?

Express the numbers as powers of $10$

Given, a million

$$\begin{gathered} 1million=1,000,000={10}^6 \\ 1thousand=1000={10}^3 \end{gathered}$$

Number of thousands in $1million=\frac{{10}^6}{{10}^3}={10}^3$

Hence, there are ${10}^{3}or1thousand$ thousands in a million.