Long Multiplication: 90 × 90

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

What is 90 × 90?

Answer

90 × 90 =
8,100

One partial product: the only non-zero digit of 90 is 9, and it stands for 9 × 10: 90 × 90 = 8,100.

90 × 90 in a column

90
×90
8100

In the column: product 8,100.

Step by step: 90 × 90

  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 9, and it stands for 90: 90 × 90 = 8,100.
    • 0 × 9 = 0. Write 0.
    • 9 × 9 = 81. Write 1 and carry 8.
    • No digits are left, so the carried 8 is written in front: the partial product is 810.
  3. Product8,100

Similar examples to practise

See Also

Recalculate with different values ↑

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

FAQ

What is 90 × 90?

90 × 90 = 8,100

Is 8,100 a square number?

Yes. 90 × 90 = 8,100, so 8,100 is the square of 90. A square is simply a number multiplied by itself, which is why both factors here are the same.

How do you check that 90 × 90 = 8,100?

Divide the product back by one of the factors: 8,100 ÷ 90 = 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 × 90?

Only one of them counts: every other digit of 90 is a zero and contributes nothing, so the work comes down to 90 × 90 = 8,100, with nothing left to add.

See Also