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ホーム›表計算とデータ

表計算の数式

ExcelとGoogleスプレッドシートで毎週のように使う数式を学ぶ6つの単元です。$B$1のドル記号から始まり、SUM、AVERAGE、COUNT、四捨五入、IF、ANDとORを通って、VLOOKUPで終わります。単元ごとに二つのソフトの違いを示し、課題つきの練習用シートがあります。

進み具合
  1. 1絶対参照と複合参照
  2. 2SUM、AVERAGE、COUNT、MIN、MAX
  3. 3四捨五入：ROUNDとセルの見え方
  4. 4IFで判断する
  5. 5AND、OR、IFの入れ子
  6. 6VLOOKUPで検索する
このコースの出典 (19)
  • Microsoft Support, "Switch between relative, absolute, and mixed references" (support.microsoft.com/en-us/office/dfec08cd-ae65-4f56-839e-5f0d8d0baca9: $ before column and row, F4 to switch, copying two down and two right: $A$1 stays, A$1 to C$1, $A1 to $A3, A1 to C3)
  • Microsoft Support, "AVERAGE function" (support.microsoft.com/en-us/office/047bac88-d466-426c-a32b-8f33eb960cf6: text, logical values and empty cells in a reference ignored, zeros included; 10, 7, 9, 27, 2 gives 11, with 5 gives 10; mean 5, median 4, mode 3 for 2 3 3 5 7 10)
  • Microsoft Support, "COUNT function" (support.microsoft.com/en-us/office/a59cd7fc-b623-4d93-87a4-d23bf411294c: only numbers counted, dates count, errors and text do not)
  • Microsoft Support, "ROUND function" (support.microsoft.com/en-us/office/c018c5d8-40fb-4053-90b1-b3e7f61a213c: num_digits required; 2.15 to 2.2, -1.475 to -1.48, 626.3 to 1000, 1.98 to 0, -50.55 to -100)
  • Microsoft Support, "IF function" (support.microsoft.com/en-us/office/69aed7c9-4e8a-4755-a9bc-aa8bbff73be2: value_if_false optional, text in quotes except TRUE and FALSE, 0 and #NAME? problems)
  • Microsoft Support, "VLOOKUP function" (support.microsoft.com/en-us/office/0bbc8083-26fe-4963-8ab8-93a18ad188a1: range_lookup TRUE by default, sorted first column, #N/A, #REF!, #VALUE!, absolute table range, wildcards with FALSE)
  • Microsoft Support, "XLOOKUP function" (support.microsoft.com/en-us/office/b7fd680e-6d10-43e6-84f9-88eae8bf5929: not in Excel 2016 and Excel 2019, exact match by default)
  • Microsoft Support, "How to correct a #VALUE! error" (support.microsoft.com/en-us/office/15e1b616-fbf2-4147-9c0b-0a11a20e409e: + and * may not calculate cells with text, use SUM instead, IFERROR hides all errors)
  • Microsoft Support, "Excel specifications and limits" (15 digits, 64 nested levels, 255 arguments)
  • Google Docs Editors Help, "VLOOKUP" (support.google.com/docs/answer/3093318: is_sorted TRUE by default, FALSE recommended, search down to a larger value, " Apple" and "Apple " differ, wildcards, IFNA, absolute range)
  • Google Docs Editors Help, "XLOOKUP" (support.google.com/docs/answer/12405947)
  • Google Docs Editors Help, "ROUND" (support.google.com/docs/answer/3093440: places optional, 0 by default, rounding by magnitude)
  • Google Docs Editors Help, "IF" (support.google.com/docs/answer/3093364: order of the answers is the most common problem, IFS)
  • Google Docs Editors Help, "AVERAGE" (support.google.com/docs/answer/3093615: text ignored, any number of arguments)
  • Google Docs Editors Help, "COUNTA" (support.google.com/docs/answer/3093991: zero-length strings and spaces count)
  • Google Docs Editors Help, "Keyboard shortcuts for Google Sheets" (support.google.com/docs/answer/181110: F4 and Fn+F4 while entering a formula, F4 as Redo)
  • Pryor Learning and Exceljet (F4 cycle A1, $A$1, A$1, $A1; = comparison not case-sensitive)
  • Ablebits (IF without value_if_false returns FALSE)
  • Spreadsheet Class (Sheets circular dependency shows #REF!)

確認日: 2026-10-19