Adding and subtracting within 1000 using a number line

The  exercise appears under the Early math Math Mission. This exercise practices addition and subtraction within 1000 using a number line.

Types of problems
There are two types of problem in this exercise:
 * 1) Which number line shows __ + __ ?: This problem asks the user to find which number line correctly shows the equation.
 * 1) Which expression has been solved with the following number line?: This problem shows a number line and the user is asked to find which expression has been solved using the number line.

Strategies
Knowledge of using number lines to solve equations are essential to ensure success in this exercise.


 * 1) Number lines are used to find the distance between two numbers, so user just has to follow the arrows on the number line to solve the equations.

Real-life Applications

 * 1) Knowledge of adding and subtracting numbers are essential for algebra and the higher maths.