Add and subtract using a number line

The Add and subtract using a number line exercise appears under the Early math (U.S.) Math Mission. This exercise practices a new method of addition and subtraction.

Types of Problems
There is one type of problems in this exercise:
 * 1) Find the number line: This problem provides an expression which you must use to find out which number lines best matches the expression.Number line.png

Strategies
Knowledge of addition, subtraction, and using a number line are encouraged for the best outcome in this exercise.
 * 1) Look to see if the number line mentions the first number in the expression. (e.g. the first number of 34+17 is 34.)
 * 2) Look at which operation is being used. If subtraction, the arrows on the number line should be going to the left. If addition, the arrows should be going to the right.
 * 3) If you still have options remaining, try adding/subtracting the expression yourself and find the result. The arrows on the number line should lead to your result.

== Real-life Applications ==
 * 1) Addition and subtraction applies to anything that has to do with counting,