Everyday arithmetic
Box packing in six orientations
Box packing in six orientations: For each of six axis-aligned item orientations, multiply the whole-item counts along the three container dimensions; report the best uniform orientation.
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Everyday arithmetic
Choose a tool. The method, example and assumptions are included.
Everyday arithmetic
Fraction to decimal
Fraction to decimal: Numerator ÷ denominator
Everyday arithmetic
Number rounding
Number rounding: Round to the selected number of decimal places
Everyday arithmetic
Percentage
Percentage: value × percentage ÷ 100
Everyday arithmetic
Percentage change
Percentage change: (new − original) ÷ |original| × 100
Everyday arithmetic
Percentage difference
Percentage difference: Absolute difference ÷ arithmetic mean × 100
Everyday arithmetic
Percentage points
Percentage points: New rate minus original rate, in percentage points
Everyday arithmetic
Proportion solver
Proportion solver: x = b × c ÷ a
Everyday arithmetic
Ratio simplifier
Ratio simplifier: Divide each nonnegative integer by its greatest common divisor
Everyday arithmetic
Recipe ingredient batch scaler
Recipe ingredient batch scaler: Scale factor = target servings/original servings.
Everyday arithmetic
Reverse percentage
Reverse percentage: Original = final ÷ (1 + increase/100)
Everyday arithmetic
Scientific notation
Scientific notation: Express the number as a coefficient multiplied by a power of ten