Showing Elementary - Mathematics - Math Grade 1 - Grade 1 - (3) Number and operations: Addition and subtraction. - Math.1.3.B (B) use objects and pictorial models to solve word problems involving joining, separating, and comparing sets within 20 and unknowns as any one of the terms in the problem such as 2 + 4 = [ ]; 3 + [ ] = 7; and 5 = [ ] - 3;


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