Use addition and subtraction to solve word problems within 20 by using concrete objects, drawings, and equations with a symbol for the unknown number to represent the problem.
- Change unknown
- Put together
- Take apart
- addition and subtraction strategies and models.
- how to form an equation.
Students are able to:
- represent quantities and operations (addition & subtraction) with concrete objects, pictorially, or symbolically.
- Use informal and mathematical language to communicate the representations.
- Accurately compute sums and differences.
Students understand that:
- addition is both putting together and adding to. subtraction is taking apart, taking from, and comparisons.
- Mathematical problems can be solved using a variety of strategies. models, and representations.
- variables in the form of blanks, boxes, or letters, represent unknown quantities when representing mathematical situations algebraically.