Multiplying by 0 or 1

The exercise Multiplying by 2 is under the 3rd grade (U.S.) Math Mission. It does not appear in the Learning Dashboard though, so it is non-masterable. This exercise practices multiplying 1-digit numbers by 0 or 1.

Types of Problems
There is one type of problem in this exercise:
 * 1) Multiply the numbers: This problem asks a multiplication problem. The student is expected to find the quotient and put it in the appropriate space.

Strategies
This exercise is easy to get speed badges because it is just easy multiplication problems. The speed badges are easy too because student has to get 10 problems correct in a row.
 * 1) Problems should be solved mentally.
 * 2) Take the time. The student has 5 seconds to solve each problem if he/she wants to get a speed badge.

Real-life Applications

 * 1) Multiplication is needed and used by mechanics for repairing cars by multiplying when they overhaul the engine, measure the pistons or just to put in a new gearbox or engine.