17 3 The student answers The student answers The student answers The student correctly: one of four problems two of four problems three or four problems Answers correctly and models correctly and models correctly and models False 2.NBT.5 mental strategies fewer mental strategies at mental strategies at True than two times. least twice. least three times. False False Uses and models a mental strategy such as arrow notation, adding the same amount to the subtrahend as to the minuend to make a multiple of ten, adding or subtracting a multiple of 10 and adjusting the solution as necessary, or other strategies as noted in the Module Overview. 4 The student answers Student answers one of Student answers Parts The student correctly: both parts correctly. the parts correctly. (a) and (b) correctly but Demonstrates an does not show work in understanding of the 2.OA.1 Part (b), or answers one role of place value part incorrectly but 2.NBT.5 and the arithmetic shows correct work in properties in Sarah’s 2.NBT.9 Part (b). strategy. Uses an alternate place value strategy to solve Part (b), e.g., 47 + 18 = 45 + 20 = 65
17 3 2.NBT.5 The student answers one of four problems correctly and models mental strategies fewer than two times. The student answers two of four problems correctly and models mental strategies at least twice. The student answers three or four problems correctly and models mental strategies at least three times. The student correctly: Answers False True False False Uses and models a mental strategy such as arrow notation, adding the same amount to the subtrahend as to the minuend to make a multiple of ten, adding or subtracting a multiple of 10 and adjusting the solution as necessary, or other strategies as noted in the Module Overview. 4 2.OA.1 2.NBT.5 2.NBT.9 The student answers both parts correctly. Student answers one of the parts correctly. Student answers Parts (a) and (b) correctly but does not show work in Part (b), or answers one part incorrectly but shows correct work in Part (b). The student correctly: Demonstrates an understanding of the role of place value and the arithmetic properties in Sarah’s strategy. Uses an alternate place value strategy to solve Part (b), e.g., 47 + 18 = 45 + 20 = 65