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    Long Multiplication: 20 × 20

    Long Multiplication Calculator
    Multiplicand (number to be multiplied)
    Multiplier (number to multiply by)

    What is 20 × 20?

    Answer

    20 × 20 =
    400

    One partial product: the only non-zero digit of 20 is 2, and it stands for 2 × 10: 20 × 20 = 400.

    20 × 20 in a column

    20
    ×20
    400

    In the column: product 400.

    Step by step: 20 × 20

    1. Step 1The last digit of the multiplier is 0, so this partial product is 0 and adds nothing to the total.
    2. Step 2The next digit of the multiplier is 2, and it stands for 20: 20 × 20 = 400.
      • 0 × 2 = 0. Write 0.
      • 2 × 2 = 4. Write 4.
    3. Product400

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    <a href="https://calculat.io/en/number/long-multiplication/20--20">20 × 20 = 400 - Long Multiplication - Calculatio</a>Copy
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    20 × 20 = 400 - Long Multiplication. 20 × 20 = 400. Long multiplication step by step: every carry, every partial product and the final sum.
    https://calculat.io/en/number/long-multiplication/20--20/generated.jpgCopy

    Products of 20

    MultiplicationProduct
    20 × 120
    20 × 240
    20 × 360
    20 × 480
    20 × 5100
    20 × 6120
    20 × 7140
    20 × 8160
    20 × 9180
    20 × 10200
    20 × 11220
    20 × 12240
    20 × 20400
    Recalculate with different values ↑

    FAQ

    What is 20 × 20?

    20 × 20 = 400

    Is 400 a square number?

    Yes. 20 × 20 = 400, so 400 is the square of 20. A square is simply a number multiplied by itself, which is why both factors here are the same.

    How do you check that 20 × 20 = 400?

    Divide the product back by one of the factors: 400 ÷ 20 = 20 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

    What are the partial products of 20 × 20?

    Only one of them counts: every other digit of 20 is a zero and contributes nothing, so the work comes down to 20 × 20 = 400, with nothing left to add.

    See Also