Formula and interpretation
decimal = percent ÷ 100.
Move the decimal point two places left: 12.5% → 0.125.
Worked check
12.5% becomes 0.125 because percent means “per hundred”: 12.5 ÷ 100 = 0.125. Keep the percent sign out of the decimal result unless the destination specifically expects a percentage-formatted value.
Rule: decimal = percent ÷ 100. Move the decimal point two places left: 12.5% → 0.125. For a final check, estimate the expected size of the answer before copying it, keep units consistent, and round only the displayed result rather than intermediate values. Re-enter one simple case by hand when possible; a result with the wrong sign or order of magnitude usually points to an input or reference-base mistake.