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This printable addition worksheet maker limits addends to numbers that are multiples of 10, 100, or 1000. You can quickly customize the number of problems, number of addends, digits in each addend, and format of the problems. Each worksheet can include 1 to 30 unique, randomly generated addition scenarios. Each problem can be set-up to include 2 to 5 addends that are 2 to 4 digits in length. You can also customize the page header and choose if the problems should be generated in a vertical or horizontal format. After customizing the worksheet, you can download it as a PDF in US Letter or A4 format. Each PDF includes a matching answer key for the unique worksheet.