Adding three-digit numbers 100 to 400 (Horizontal Questions - Half Page x 2)

This basic Addition worksheet is designed to help kids practice adding three-digit numbers (100 through 400) with addition questions that change each time you visit. This math worksheet is printable and displays two half page math sheets with Horizontal Addition questions.

With this math sheet generator, you can easily create Addition worksheets that are never the same and always different, providing you with an unlimited supply of math sheets to use in the classroom or at home.

Each math sheet also has an optional answer key checkbox that you can select, if you wish to print an answer key to go along with your math worksheet. And there are six different question styles to choose from, as listed below.

Possible Questions:

The possible addition questions on this math worksheet are:

• 100+100, 101+100, 102+100, 103+100, 104+100, 105+100 ... 400+100
• 100+101, 101+101, 102+101, 103+101, 104+101, 105+101 ... 400+101
• 100+102, 101+102, 102+102, 103+102, 104+102, 105+102 ... 400+102
• ...
• 100+400, 101+400, 102+400, 103+400, 104+400, 105+400 ... 400+400