Left-handed mystery addition tables

What is on this worksheet

Mystery addition tables with the row headers on the right-hand side, so a left-handed writer does not cover them.

• Left-handed layout: On

You can change any of these settings above. Press "New problems" for a fresh set with the same settings, or pick Version A to Z to print different sheets for neighboring desks. The answer key always matches.

About mystery addition tables

The number to add is given at the top of the first column, and the squares beneath it show the sums. Students subtract to find the row headers, use the first row to find the other column headers, and then complete every sum.

For younger children, show every header and let them fill a small square of sums. Every table has exactly one solution, and the table structure (rows, columns, adding the same number) becomes visible.

Printing

US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.