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Algebra • Unknown Numbers Essential Question How can you use a related fact to find an unknown number? Use the to watch the lesson Close lesson and return to Use the button Use the or tool Click button to turn in your work Complete all of the pages of problems Listen to the example on page 1 GO TO iXl.com For Extra Practice! https://www.ixl.com/math/grade-1/fact-families https://www.ixl.com/math/grade-1/related-addition-facts