Adding three numbers is a natural next step after adding two, and it teaches a useful idea: numbers can be added in any order. A child who spots that 6 + 4 makes ten can add the 5 afterwards and get 15 at once. This worksheet gives twenty problems with three single-digit numbers, all written on one line with a line for the sum.
Some have numbers that make ten, and some do not, so your child has to look before adding. Suggest circling or covering two numbers that go together, find their sum, and then add the third. Look for ten-makers, doubles and pairs that are easy for your child, and check the sum by adding in a different order.
What your child will learn
Add three single-digit numbers
Look for two numbers that make ten
Add in an order that makes the sum easier
Common Core standard: 2.OA.B.2
Worked example
For 6 + 5 + 4, add 6 + 4 first to make 10, then add 5. The sum is 15.
Common mistake
Adding only two of the three numbers, or dropping a number while counting on.
Helpful hint
Look for two numbers that make ten, add those first, then add the third.