Pie charts are most effective when the values add up to what total?

• A. 100 percent.
• B. 50 percent.
• C. All percentages must equal the same value.
• D. Any total percentage is acceptable.

Answer: (B)

Pie charts show parts of a single whole, so all the slices must add up to the entire amount being represented. Expressing that total as 100 percent (or 1.0 in decimal) makes it clear how each slice relates to the whole. If the values don’t sum to 100 percent, the chart wouldn’t accurately reflect the complete total, and it could mislead about how big each portion really is. Therefore, pie charts are most effective when the values add up to 100 percent.