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.

Bullseye! Children practice adding and combining numbers with this great math game.

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!

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.

Estimate the sum in each of these math problems. Challenge your child to round to the nearest hundred first, then add the two rounded numbers.

Kids solve addition problems with three-digit addends to move from bubble to bubble on this second grade math worksheet.

Kids practice two-digit subtraction and rounding in this challenging 2nd grade math worksheet.

An easy method to grasp numbers, this base 10 worksheet with simple addition helps your child to understand place values while honing her arithmetic skills.

Sweeten math time with our ice cream-themed worksheet. Using the concept of base 10, this math practice sheet teaches kids about place values.

Fish for the right numbers with this base 10 worksheet. Simple addition helps your kid to understand place values while honing his arithmetic skills.

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

Your child will practice two-digit addition and rounding to the nearest hundred in this challenging 2nd grade math worksheet.

Add multi-digit numbers with ease in this colorful second-grade math worksheet!

Practice a visual addition strategy with this second-grade place value worksheet!

Learn to perform addition with three-digit numbers in this essential worksheet!

Practice your addition skills with this inviting second-grade worksheet!