Operation Station CFU WorksheetOperation Station Check for Understanding • Part 1: Subtraction Name: Date: Directions: Solve each subtraction equation below. Use the completely blank workspace inside each box to show your math strategy. Write your final answer in the blank space. Problem 1 382 - 147 = Problem 2 627 - 384 = Problem 3 723 - 456 = Problem 4 503 - 245 = Page 1 of 2 Operation Station Check for Understanding • Part 2: Addition Directions: Solve each addition equation below. Use the extra-large blank workspace to show your math strategy. Write your final answer in the blank space. Problem 5 248 + 375 = Problem 6 489 + 153 = Page 2 of 2
Operation Station Answer KeyTeacher Answer Key Operation Station Diagnostic Key • Part 1: Subtraction Name: SOLUTIONS Date: CLASS KEY Grading Guide: Standard vertical algorithm strategies are demonstrated below. Correct regrouping marks are shown in red. Award partial credit for correct strategy execution. Problem 1 Regroup 1s Only 382 - 147 = 235 712 382 -1 4 7 2 3 5 Problem 2 Regroup 10s Only 627 - 384 = 243 512 62 7 -3 8 4 2 4 3 Problem 3 Regroup Both (1s & 10s) 723 - 456 = 267 61113 723 -4 5 6 2 6 7 Problem 4 Across Zero in Tens 503 - 245 = 258 4913 503 -2 4 5 2 5 8 Page 1 of 2 Teacher Answer Key Operation Station Diagnostic Key • Part 2: Addition Grading Guide: Addition regrouping marks are shown in red. Verify correct column alignment and partial sums. Problem 5 Addition with Regrouping 248 + 375 = 623 ¹¹ 2 4 8 +3 7 5 6 2 3 Problem 6 Addition with Regrouping 489 + 153 = 642 ¹¹ 4 8 9 +1 5 3 6 4 2 Page 2 of 2