Grade 3 - Number
Standard 3.N.9 - Find the missing number of a subtraction sentence.
Included Skills: Subtraction
Demonstrate an understanding of addition and subtraction of numbers with answers to 1000 (limited to one, two and three digit numerals), concretely, pictorially and symbolically, 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. • Achievement Indicators: - 3N9.1 Model the addition of two or more given numbers, using concrete or visual representations, and record the process symbolically. - 3N9.2 Create an addition or subtraction story problem for a given solution. - 3N9.3 Determine the sum of two given numbers, using a personal strategy; e.g., for 326 + 48, record 300 + 60 + 14. - 3N9.4 Refine personal strategies to increase their efficiency. - 3N9.5 Solve a given problem involving the sum or difference of two given numbers. - 3N9.6 Model the subtraction of two given numbers, using concrete or visual representations, and record the process symbolically. - 3N9.7 Determine the difference of two given numbers, using a personal strategy; e.g., for 127 – 38, record 38 + 2 + 80 + 7 or 127 – 20 – 10 – 8.