Multiplication and division with powers of ten

The  exercise appears under the 8th grade (U.S.) Math Mission. This exercise practices operations with powers of ten.

Types of Problems
There is two types of problems in this exercise:
 * 1 Find __'s mistake.: This problem has a step-by-step demonstration of evaluating an expression, but one line may have a mistake. The student is asked to find which mistake they made.


 * 2. Solve.: This problem has an equation (e.g, $$\frac{-7\times 10^{-1}}{-5\times 10^{-2}}$$, and the student is asked to solve the equation.

Strategies
Knowledge of operations and powers of ten is essential to ensure success on this exercise.
 * 1. User has to break the fraction in half, then multiply, to solve the problem.

Real-life Applications

 * 1. These problems can occur in scientific formulas.