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    Long Multiplication: 40 × 40

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

    What is 40 × 40?

    Answer

    40 × 40 =
    1,600

    40 × 40 is a square: a number multiplied by itself, so 1,600 is the square of 40. Below, 40 is multiplied by 40 in a column, digit by digit.

    40 × 40 in a Column

    The multiplicand goes on top, the multiplier underneath, both aligned on the right. Only one digit of the multiplier is not zero, and it stands for 40, so there is a single partial product and the answer goes straight under the line.

       40
    ×  40
     1600
    40 × 40 = 1,600

    Step-by-Step Solution

    Step 1: The last digit of the multiplier is 0, so this partial product is 0 and adds nothing to the total.

    Step 2: The next digit of the multiplier is 4, and it stands for 40: 40 × 40 = 1,600.

    • 0 × 4 = 0. Write 0.
    • 4 × 4 = 16. Write 6 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 160.

    40 × 40

    =

    1,600

    Check It, and What It Is Not

    Check by dividing back. Multiplication and division undo each other, so 1,600 ÷ 40 = 40 must come out exactly, with no remainder.

    Fractions are a different calculation. Both factors here are whole numbers; for 2/3 or 2 3/4 use the fraction multiplication calculator, which multiplies numerators and denominators separately.

    40 × 40 is a number, not an area. If those are the sides of a room in feet, the answer is 1,600 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.

    Related Calculations

    See Also

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    40 × 40 = 1,600 - Long Multiplication. 40 × 40 = 1,600. Long multiplication step by step: every carry, every partial product and the final sum.
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    Products of 40

    MultiplicationProduct
    40 × 280
    40 × 3120
    40 × 4160
    40 × 5200
    40 × 6240
    40 × 7280
    40 × 8320
    40 × 9360
    40 × 10400
    40 × 11440
    40 × 12480
    40 × 15600
    40 × 16640
    40 × 20800
    40 × 251,000
    40 × 301,200
    40 × 401,600

    Long Multiplication Calculator

    This calculator multiplies two whole numbers the way it is done on paper: digit by digit, carrying where the column overflows, then adding the partial products together. For example, it can help you find out what is 40 × 40? (The answer is: 1,600). Enter the multiplicand (e.g. '40') and the multiplier (e.g. '40') and hit the button. The order of the two numbers never matters: swapping the factors leaves the product unchanged, so either one can go on top. Fractions and mixed numbers belong to the fraction multiplication calculator, and the reverse operation is long division.
    Long Multiplication Calculator
    Multiplicand (number to be multiplied)
    Multiplier (number to multiply by)

    FAQ

    What is 40 × 40?

    40 × 40 = 1,600

    Is 1,600 a square number?

    Yes. 40 × 40 = 1,600, so 1,600 is the square of 40. A square is simply a number multiplied by itself, which is why both factors here are the same.

    How do you check that 40 × 40 = 1,600?

    Divide the product back by one of the factors: 1,600 ÷ 40 = 40 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

    What are the partial products of 40 × 40?

    Only one of them counts: every other digit of 40 is a zero and contributes nothing, so the work comes down to 40 × 40 = 1,600, with nothing left to add.

    See Also