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4 thoughts on “Significant Figures Worksheet PDF – Addition Practice

    • Anne Helmenstine

      10000 would be correct because 20 only has 1 significant digit. One way to determine the number of significant digits is to write the numbers using scientific notation. You’d have 12000 is 1.2 x 10e4 and 20 is 2 x 10e1. Use the smallest number of significant digits (which would be one in this case).