Grade 2 - Number
Standard 2.N.9 - Complete the addition sentence by filling in the missing number with sums up to 20.
Included Skills: Addition
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 manipulatives • creating and solving problems that involve addition and subtraction • explaining that the order in which numbers are added does not affect the sum • explaining that the order in which numbers are subtracted may affect the difference. • Achievement Indicators - Model addition and subtraction using concrete materials or visual representations and record the process symbolically. - Create an addition or a subtraction number sentence and a story problem for a given solution. - Solve a given problem involving a missing addend and describe the strategy used. - Solve a given problem involving a missing minuend or subtrahend and describe the strategy used. - Match a number sentence to a given missing addend problem. - Match a number sentence to a given missing subtrahend or minuend problem. - Add a given set of numbers in two different ways, and explain why the sum is the same, e.g., 2 + 5 + 3 + 8 = (2 + 3) + 5 + 8 or 5 + 3 + (8 + 2).