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Use properties as strategies to add and subtract.
Solve problems that call for addition of three whole numbers whose sum is within 20.
1.NS.A.1 Count to 120, starting at any number less than 120.
1.NS.A.2 Read and write numerals and represent a number of objects with a written numeral.
Compare two two-digit numbers using the symbols >, = or <.
Add within 100.
Add or subtract a multiple of 10 from another two-digit number, and justify the solution.
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