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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Recalculate with different values ↑

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

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