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    Long Multiplication: 90 × 20

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

    What is 90 × 20?

    Answer

    90 × 20 =
    1,800

    90 × 20 and 20 × 90 are the same product — the order of the factors never changes the answer, only the working. Below, 90 is multiplied by 20 in a column, digit by digit.

    90 × 20 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 20, so there is a single partial product and the answer goes straight under the line.

       90
    ×  20
     1800
    90 × 20 = 1,800

    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 2, and it stands for 20: 90 × 20 = 1,800.

    • 0 × 2 = 0. Write 0.
    • 9 × 2 = 18. Write 8 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 180.

    90 × 20

    =

    1,800

    Check It, and What It Is Not

    Check by dividing back. Multiplication and division undo each other, so 1,800 ÷ 20 = 90 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.

    90 × 20 is a number, not an area. If those are the sides of a room in feet, the answer is 1,800 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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    90 × 20 = 1,800 - Long Multiplication. 90 × 20 = 1,800. 20 × 90 gives the same product. Long multiplication step by step: every carry, every partial product and the final sum.
    https://calculat.io/en/number/long-multiplication/90--20/generated.jpgCopy

    Products of 90

    MultiplicationProduct
    90 × 4360
    90 × 5450
    90 × 6540
    90 × 7630
    90 × 8720
    90 × 9810
    90 × 10900
    90 × 11990
    90 × 121,080
    90 × 151,350
    90 × 161,440
    90 × 201,800
    90 × 252,250
    90 × 302,700
    90 × 403,600
    90 × 504,500
    90 × 605,400
    90 × 756,750
    90 × 807,200
    90 × 908,100

    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 90 × 20? (The answer is: 1,800). Enter the multiplicand (e.g. '90') and the multiplier (e.g. '20') and hit the button. The order of the two numbers does not matter — 90 × 20 and 20 × 90 are the same product — so either number 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 90 × 20?

    90 × 20 = 1,800

    Is 90 × 20 the same as 20 × 90?

    Yes. Multiplication is commutative, so both come to 1,800. Only the working differs: this page multiplies by 20, which gives a single partial product.

    How do you check that 90 × 20 = 1,800?

    Divide the product back by one of the factors: 1,800 ÷ 20 = 90 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

    What are the partial products of 90 × 20?

    Only one of them counts: every other digit of 20 is a zero and contributes nothing, so the work comes down to 90 × 20 = 1,800, with nothing left to add.

    See Also