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.

How quickly can your math master round and add up these sums? Help him build a valuable math skill with this estimation worksheet.

Practice place value, rounding and addition, all in one worksheet! Your child will learn to add up estimated sums quickly in his head.

Math whizzes can learn to estimate sums quickly using front-end estimation! Round to the highest place value and then add or subtract the rounded numbers.

Can your little math whiz add up sums quickly in his head? Teach him to estimate before adding, a great skill to put to use in everyday life!

This rounding worksheet helps your students practice rounding three-digit numbers to the nearest hundreds, tens, and ones.

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