Long Multiplication: 81 × 9

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

What is 81 × 9?

Answer

81 × 9 =
729

One partial product: 81 × 9 = 729. 9 × 81 gives the same 729.

81 × 9 in a column

81
×9
729

In the column: product 729.

Step by step: 81 × 9

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 9: 81 × 9 = 729.
    • 1 × 9 = 9. Write 9.
    • 8 × 9 = 72. Write 2 and carry 7.
    • No digits are left, so the carried 7 is written in front: the partial product is 729.
  2. Product729

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Recalculate with different values ↑

Products of 81

MultiplicationProduct
71 × 9639
72 × 9648
73 × 9657
74 × 9666
75 × 9675
76 × 9684
77 × 9693
78 × 9702
79 × 9711
80 × 9720
81 × 9729
82 × 9738
83 × 9747
84 × 9756
85 × 9765
86 × 9774
87 × 9783
88 × 9792
89 × 9801
90 × 9810

FAQ

What is 81 × 9?

81 × 9 = 729

Is 81 × 9 the same as 9 × 81?

Yes. Multiplication is commutative, so both come to 729. Only the working differs: this page multiplies by 9, which gives a single partial product.

How do you check that 81 × 9 = 729?

Divide the product back by one of the factors: 729 ÷ 9 = 81 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

What are the partial products of 81 × 9?

There is only one: the multiplier 9 has a single digit, so 81 × 9 = 729 is written straight under the line, with no addition step.

See Also