Math Games

Grade 2 - The Number System

Standard 2.NS.1.9 - Solve subtraction equations involving tens with numbers up to 120

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.