Mental Math - Addition

The video tutorial teaches mental math techniques for quick addition by grouping numbers into sets of tens or hundreds. It begins with a basic example of adding smaller numbers by identifying pairs that sum to ten, then progresses to larger numbers, demonstrating how to find sets of hundreds. The lesson emphasizes the use of the commutative and associative properties of addition to rearrange and group numbers efficiently, making mental calculations easier.

How do you find sets of 100 in the expression 50 plus 80 plus 40 plus 20 plus 60?

What is the final sum of the add-ins 50 plus 80 plus 40 plus 20 plus 60?