Long Multiplication: 40 × 20

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

What is 40 × 20?

Answer

40 × 20 =
800

One partial product: the only non-zero digit of 20 is 2, and it stands for 2 × 10: 40 × 20 = 800. 20 × 40 gives the same 800.

40 × 20 in a column

40
×20
800

In the column: product 800.

Step by step: 40 × 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: 40 × 20 = 800.
    • 0 × 2 = 0. Write 0.
    • 4 × 2 = 8. Write 8.
  3. Product800

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Recalculate with different values ↑

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

FAQ

What is 40 × 20?

40 × 20 = 800

Is 40 × 20 the same as 20 × 40?

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

How do you check that 40 × 20 = 800?

Divide the product back by one of the factors: 800 ÷ 20 = 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 × 20?

Only one of them counts: every other digit of 20 is a zero and contributes nothing, so the work comes down to 40 × 20 = 800, with nothing left to add.

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