Adding large numbers becomes easy when you know how to round. Add two groups of numbers, round them to the nearest 10, then add again.

Adding and subtracting large numbers can sometimes be difficult. Estimating is an easy way to figure out if your answer is close, or if you need to try again.

With the concept of base 10, it's easy to understand place values. Help your child learn that each digit is ten times the value of the one to its right.

Simple addition problems help your child to understand place values while honing arithmetic skills. A great review of the base 10 system.