Long Multiplication: 40 × 40

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

What is 40 × 40?

Answer

40 × 40 =
1,600

One partial product: the only non-zero digit of 40 is 4, and it stands for 4 × 10: 40 × 40 = 1,600.

40 × 40 in a column

40
×40
1600

In the column: product 1,600.

Step by step: 40 × 40

  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 4, and it stands for 40: 40 × 40 = 1,600.
    • 0 × 4 = 0. Write 0.
    • 4 × 4 = 16. Write 6 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 160.
  3. Product1,600

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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 × 40?

40 × 40 = 1,600

Is 1,600 a square number?

Yes. 40 × 40 = 1,600, so 1,600 is the square of 40. A square is simply a number multiplied by itself, which is why both factors here are the same.

How do you check that 40 × 40 = 1,600?

Divide the product back by one of the factors: 1,600 ÷ 40 = 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 × 40?

Only one of them counts: every other digit of 40 is a zero and contributes nothing, so the work comes down to 40 × 40 = 1,600, with nothing left to add.

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