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Grade 3 - The Number System
Standard 3.NS.1.9 - Simplify both sides of the equation and find the missing number that makes the equation true.
Students will be expected to demonstrate an understanding of addition and subtraction of numbers (limited to 1-, 2-, and 3-digit numerals) with answers to 1000 by • using personal strategies for adding and subtracting with and without the support of manipulatives • creating and solving problems in context that involve addition and subtraction of numbers concretely, pictorially, and symbolically
• Performance Indicators - N09.01 Model the addition of two or more given numbers using concrete or visual representations and record the process symbolically. - N09.02 Model the subtraction of two given numbers using concrete or visual representations and record the process symbolically. - N09.03 Create an addition or subtraction story problem for a given solution. - N09.04 Determine the sum of two given numbers using a personal strategy, e.g., for 326 + 48, record 300 + 60 + 14. - N09.05 Determine the difference of two given numbers using a personal strategy, e.g., for 127 â€“ 38, record 2 + 80 + or 127 â€“ 20 â€“ 10 â€“ 8. - N09.06 Solve a given problem involving the sum or difference of two given numbers.