This tutorial explains how to calculate percents that are powers of 10. [2:59]

This tutorial demonstrates how to estimate the answer to a word problem by multiplying mentally. [3:27]

This video shows a mental math strategy for subtracting numbers.

This video shows how to round and then multiply two numbers in the context of solving a real-world problem.

This video explains some strategies that are helpful for adding two-digit numbers in your head. [8:00]

In this lesson, you will learn to add and subtract by using doubles. [3:42]

This video lesson teaches how to divide fractions by whole numbers (sharing divisions) using mental math.