6.1. Hacks 73–10573. Add Descriptive Text to Your Formulas74. Move Relative Formulas Without Changing References75. Compare Two Excel Ranges6.4.1. Method 1: Using True or False6.4.2. Method 2: Using Conditional Formatting76. Fill All Blank Cells in a List6.5.1. Method 1: Filling Blanks via a Formula6.5.2. Method 2: Filling Blanks via a Macro77. Make Your Formulas Increment by Rows When You Copy Across Columns78. Convert Dates to Excel Formatted Dates79. Sum or Count Cells While Avoiding Error Values80. Reduce the Impact of Volatile Functions on Recalculation81. Count Only One Instance of Each Entry in a List6.10.1. Before Excel 20076.10.2. Excel 20076.10.3. Using a Pivot Table82. Sum Every Second, Third, or Nth Row or Cell6.11.1. Using an Array Formula6.11.2. Using SUMPRODUCT6.11.3. Using DSUM83. Find the Nth Occurrence of a Value84. Make the Excel Subtotal Function Dynamic85. Add Date Extensions86. Convert Numbers with the Negative Sign on the Right to Excel Numbers87. Display Negative Time Values6.16.1. Method 1: Changing Excel’s Default Date System6.16.2. Method 2: Using the TEXT Function6.16.3. Method 3: Using a Custom Format88. Use the VLOOKUP Function Across Multiple Tables89. Show Total Time As Days, Hours, and Minutes90. Determine the Number of Specified Days in Any Month91. Construct Mega-Formulas92. Hack Mega-Formulas that Reference Other Workbooks93. Hack One of Excel’s Database Functions to Take the Place of Many Functions6.22.1. Using DCOUNT to Filter on Two Criteria6.22.2. Making the Comparison Operators Interchangeable94. Extract Specified Words from a Text String6.23.1. Getting the Last Word6.23.2. Getting the First Word6.23.3. Get the Nth Word95. Count Words in a Cell or Range of Cells6.24.1. SUBSTITUTE6.24.2. LEN6.24.3. Putting It Together6.24.4. Hacking the Hack96. Return a Worksheet Name to a Cell6.25.1. Create a List of Worksheet Names6.25.2. Extract Worksheet Names Only6.25.3. Use the List in Formulas6.25.4. Make the Range Address Variable97. Sum Cells with Multiple Criteria6.26.1. SUMIF6.26.2. DSUM6.26.3. SUMPRODUCT6.26.4. SUM and IF98. Count Cells with Multiple Criteria6.27.1. Array Formulas6.27.2. SUMPRODUCT99. Calculate a Sliding Tax Scale6.28.1. Using IF/SUM6.28.2. Using a VLOOKUP Formula6.28.3. Using a Custom Function100. Add/Subtract Months from a Date6.29.1. EDATE6.29.2. Without EDATE101. Find the Last Day of Any Given Month6.30.1. Using Formulas6.30.2. Using EOMONTH6.30.3. Using a Custom Function102. Calculate a Person’s Age103. Return the Weekday of a Date6.32.1. Get the Weekday as a Number6.32.2. Return the Weekday as Weekday Name6.32.3. Return the Weekday as Weekday Text104. Evaluate a Text Equation105. Lookup from Within a Cell6.34.1. CHOOSE and MATCH6.34.2. Keeping It Clean and Global6.34.3. Lookup Scale