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Introduce algebra to your student or child with these customizable and printable missing number subtraction worksheets. Each worksheet is generated using an algorithm that randomly selects unique numbers that meet your specifications. This allows you to create multiple unique worksheets without repeating the same subtraction scenarios. Each worksheet can include up to 30 problems. The minuends can be set to contain 1 to 4 digits each and the subtrahends can be set to contain 1 to 3 digits each. Additionally, you can choose if the blanks occur in the minuend spot, subtrahend spot, or randomly. Each problem is generated to have a positive difference unless the minuend length is set to be shorter than the subtrahends. After you have customized the worksheet you can download it as a printable PDF that includes a matching answer key. The PDF can be optimized for US Letter or A4 paper sizes.