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Grade 2 - Number

Standard 2.N.9 - Practice solving subtraction sentences up to 100.

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.
using the commutative property of addition (the order in which numbers are added does not affect the sum).
using the associative property of addition (grouping a set of numbers in different ways does not affect the sum).
explaining that the order in which numbers are subtracted may affect the difference.
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.
Refine personal strategies to increase their efficiency.
Match a number sentence to a given missing addend problem.
Match a number sentence to a given missing subtrahend or minuend problem.
Explain or demonstrate why 5 + 6 = 6 + 5.
Add a given set of numbers, using the associative property of addition, and explain why the sum is the same; e.g., 2 + 5 + 3 + 8 = (2 + 3) + 5 + 8 or 5 + 3 + (8 + 2).
Solve a given problem, using horizontal and vertical formats.
Solve a given problem using the standard/traditional addition algorithm.
Solve a given problem using the standard/traditional subtraction algorithm.

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