How this calculator works
Each decimal digit contributes its value times a power of ten. Digits left of the decimal have non-negative exponents, while digits to the right have negative exponents. Zero contributions are omitted. Negative values put one minus sign around the full expansion. Combine mode sums numeric place-value contributions before expanding.
Formula
x = sign(x) × sum(digit_k × 10^k). For example, the hundredths place has k = -2.
Worked example
305.07 = 300 + 5 + 0.07 = 3 × 10^2 + 5 × 10^0 + 7 × 10^-2. Combining 400, 20 and 6 gives 426.
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Frequently asked questions
Why are zero digits omitted?
A zero contributes nothing to the sum. Its position is still reflected in the powers of ten of the other digits.
Can I expand a negative number?
Yes. The minus sign applies to the entire positive-magnitude expansion.
Will 1.20 keep its final zero?
No. Numeric inputs treat 1.20 and 1.2 as the same value. This tool explains place value rather than significant-figure notation.