{"product_id":"상위권연산-960-c1","title":"Top-Tier Calculation 960 C1","description":"Description: Top-Tier Calculation 960 approaches number and arithmetic learning—the starting point of math and an essential tool across all areas—with a new philosophy and methodology. Through problem-solving-based arithmetic questions combined with diverse situations, processes, and methods, this workbook not only completes arithmetic skills but also builds higher-level mathematical thinking.\n\nTable of Contents\nC1 721~780: Addition and Subtraction of Three- and Four-Digit Numbers\nIssue 1: Addition and Subtraction of Three-Digit Numbers (1)\nIssue 2: Addition and Subtraction of Three-Digit Numbers (2)\nIssue 3: Addition and Subtraction of Four-Digit Numbers (1)\nIssue 4: Addition and Subtraction of Four-Digit Numbers (2)\nAnswer Key","brand":"IBOOKPARK","offers":[{"title":"Default Title","offer_id":49623790846180,"sku":"1388090955","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/9788\/6692\/files\/EC_83_81_EC_9C_84_EA_B6_8C_EC_97_B0_EC_82_B0-C1.jpg?v=1786422080","url":"https:\/\/ibookpark.com\/en\/products\/%ec%83%81%ec%9c%84%ea%b6%8c%ec%97%b0%ec%82%b0-960-c1","provider":"IBOOKPARK","version":"1.0","type":"link"}