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Standard 2.N.9 - Solve addition word problems with 3 or 4 numbers.

Included Skills:

Demonstrate an understanding of addition (limited to 1 and 2-digit numerals) with answers to 100 and the corresponding subtraction by:
using personal strategies for adding and subtracting with and without the support of manipulatives
creating and solving problems that involve addition and subtraction
explaining that the order in which numbers are added does not affect the sum
explaining that the order in which numbers are subtracted may affect the difference.

Achievement Indicators
Students who have achieved this outcome(s) should be able to:
- Model addition and subtraction using concrete materials or visual representations and record the process symbolically.
- Create an addition or a subtraction number sentence and a story problem for a given solution.
- Solve a given problem involving a missing addend and describe the strategy used.
- Solve a given problem involving a missing minuend or subtrahend and describe the strategy used.
- Match a number sentence to a given missing addend problem.
- Match a number sentence to a given missing subtrahend or minuend problem.
- Add a given set of numbers in two different ways, and explain why the sum is the same, e.g., 2 + 5 + 3 + 8 = (2 + 3) + 5 + 8 or 5 + 3 + (8 + 2).

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