Grade 1

Input Output Tables: Addition

A free printable input output tables: addition worksheet with an answer key. Use the rule to find each missing In or Out number. Perfect for 1st grade practice at home or in class.

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Size: US Letter (8.5 × 11 in), fits A4
PDF: 2 pages: the worksheet and its answer key
Level: Grade 1
License: Free for personal & classroom use

Find it in:Math Worksheets Input Output Tables 1st Grade Math Worksheets

About this worksheet

A free printable input output tables: addition worksheet with an answer key. Use the rule to find each missing In or Out number. First graders can do it on their own once they know the strategy at the top of the page. Check each column with the opposite operation.

Tips for using it

Have your child say each fact out loud while writing the answer.
Use small objects like buttons or cereal to check tricky problems.
Read the rule out loud before filling in a table.
Read the rule out loud before starting: plus 4, times 3.

Printing tips

Download the PDF and print at 100% (or “fit to page” on A4). Page 1 is the worksheet and page 2 is the answer key with the answers in red; print just page 1 if you want to keep the answers for checking. The PNG shows page 1 only. Free for personal, family and classroom use.