This video explains how to add 10 or 100 to a number in your head using mental visualization of base 10 blocks. The instructor reviews the structure of three-digit numbers and how each digit represents different values depending on its...

In this video, the teacher explains how to mentally add or subtract 10 to a number using a hundreds chart. The charts are used to visualize the addition or subtraction process, making it easier to understand and solve the problems mentally.

Lattice multiplication is a fast and easy way to multiply numbers and even polynomials. You write the digits of one number as different columns and the digits of the other number as different rows. Then you multiply the digits in the...

Today politicians do not much about mathematics. But interestingly George Washington and Abraham Lincoln both understood the value of mathematics. And amazingly manuscripts of their homework have survived and been preserved for hundreds...

In this lesson, students will learn how to solve addition problems using the partial sums method. They will understand how to break down numbers into expanded form and add the values of each place before combining them for a final sum....

Addition of Multi-Digit Whole Numbers.