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It is aligned with first grade common core standards.
1.OAT.1 Use addition and subtraction within 20 to solve word problems.
1.OAT.2 Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20.
1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10.
keywords: addition; subtraction; word problems; math problems; story problems; math journals