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Long Multiplication: 40 × 30

"Long Multiplication Calculator" Calculator

Multiplicand (number to be multiplied)

Multiplier (number to multiply by)

What is 40 × 30?

Answer

40 × 30 = 1,200

40 × 30 and 30 × 40 are the same product — the order of the factors never changes the answer, only the working. Below, 40 is multiplied by 30 in a column, digit by digit.

40 × 30 in a Column

The multiplicand goes on top, the multiplier underneath, both aligned on the right. Only one digit of the multiplier is not zero, and it stands for 30, so there is a single partial product and the answer goes straight under the line.

   40
×  30
 1200
40 × 30 = 1,200

Step-by-Step Solution

Step 1: The last digit of the multiplier is 0, so this partial product is 0 and adds nothing to the total.

Step 2: The next digit of the multiplier is 3, and it stands for 30: 40 × 30 = 1,200.

  • 0 × 3 = 0. Write 0.
  • 4 × 3 = 12. Write 2 and carry 1.
  • No digits are left, so the carried 1 is written in front: the partial product is 120.

40 × 30

=

1,200

Check It, and What It Is Not

Check by dividing back. Multiplication and division undo each other, so 1,200 ÷ 30 = 40 must come out exactly, with no remainder.

Fractions are a different calculation. Both factors here are whole numbers; for 2/3 or 2 3/4 use the fraction multiplication calculator, which multiplies numerators and denominators separately.

40 × 30 is a number, not an area. If those are the sides of a room in feet, the answer is 1,200 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.

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40 × 30 = 1,200 - Long Multiplication. 40 × 30 = 1,200. 30 × 40 gives the same product. Long multiplication step by step: every carry, every partial product and the final sum.
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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

About "Long Multiplication Calculator" Calculator

This calculator multiplies two whole numbers the way it is done on paper: digit by digit, carrying where the column overflows, then adding the partial products together. For example, it can help you find out what is 40 × 30? (The answer is: 1,200). Enter the multiplicand (e.g. '40') and the multiplier (e.g. '30') and hit the button. The order of the two numbers does not matter — 40 × 30 and 30 × 40 are the same product — so either number can go on top. Fractions and mixed numbers belong to the fraction multiplication calculator, and the reverse operation is long division.

"Long Multiplication Calculator" Calculator

Multiplicand (number to be multiplied)

Multiplier (number to multiply by)

FAQ

What is 40 × 30?

40 × 30 = 1,200

Is 40 × 30 the same as 30 × 40?

Yes. Multiplication is commutative, so both come to 1,200. Only the working differs: this page multiplies by 30, which gives a single partial product.

How do you check that 40 × 30 = 1,200?

Divide the product back by one of the factors: 1,200 ÷ 30 = 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 × 30?

Only one of them counts: every other digit of 30 is a zero and contributes nothing, so the work comes down to 40 × 30 = 1,200, with nothing left to add.

See Also