The LessonA number line can be used to add numbers.
Imagine we wanted to add 4 and 3.
How to Add on a Number LineAdding on a number line is easy.
QuestionUse a number line to find 4 + 3.
Find 4 on the number line.
4 + 3
Move 3 to the right along the number line.
4 + 3
Read off the number you have reached.
Answer:4 + 3 = 7
Lesson SlidesThe slider below shows another real example of how to add on a number line. Open the slider in a new tab
To Add, Go RightAdding means going right on a number line.
The Order of Adding Doesn't MatterIn our example, we have found 4 + 3.
But the order in which we add the numbers doesn't matter... we can swap the numbers around:
4 + 3 = 3 + 4This is the commutative property of addition: you can change the order of the numbers around the sign and still get the same answer.