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Grade 2 - The Number System
Standard 2.NS.1.9 - Solve subtraction word problems with numbers up to 100.
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.