1st grade math worksheets in three packs matched to the first grade Common Core. Addition and Subtraction: facts within 20, missing numbers, fact families and story problems. Place Value: tens and ones, comparing two-digit numbers, 10 more and 10 less, and counting to 120. Time and Shapes: time to the half hour, halves and fourths. Answer keys included.

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Free for home, classroom and work use. License information