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Grade 2 - The Number System

Standard 2.NS.1.9 - Solve subtraction word problems with numbers up to 100.

Included Skills:

Students will be expected to 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 manipulates
creating and solving problems that involve addition and subtraction
explaining and demonstrating that the order in which numbers are added does not affect the sum
explaining and demonstrating that the order in which numbers are subtracted matters when finding a difference

Performance Indicators
- N09.01 Solve a given story problem of any type by modelling it with materials or a diagram, and write a number sentence that represents the thinking in the solution.
- N09.02 Solve a given story problem of any type by writing a number expression and combining the numbers to complete the number sentences.
- N09.03 Match a number sentence to a given story problem.
- N09.04 Create an addition or a subtraction number sentence and a story problem for a given solution.
- N09.05 Model addition and subtraction using concrete materials or visual representations and record the process symbolically.
- N09.06 Add a given set of numbers in two different ways and explain why the sum is the same.
- N09.07 Recognize and create equivalent addition and subtraction number sentences.

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