Long Multiplication: 40 × 8

"Long Multiplication Calculator" Calculator

Multiplicand (number to be multiplied)

Multiplier (number to multiply by)

What is 40 × 8?

Answer

40 × 8 = 320

40 × 8 and 8 × 40 are the same product — the order of the factors never changes the answer, only the working. Below, 40 is multiplied by 8 in a column, digit by digit.

40 × 8 in a Column

The multiplicand goes on top, the multiplier underneath, both aligned on the right. The multiplier has a single digit, so there is one partial product and the answer goes straight under the line.

  40
×  8
 320
40 × 8 = 320

Step-by-Step Solution

Step 1: Multiply the multiplicand by the last digit of the multiplier, 8: 40 × 8 = 320.

  • 0 × 8 = 0. Write 0.
  • 4 × 8 = 32. Write 2 and carry 3.
  • No digits are left, so the carried 3 is written in front: the partial product is 320.

40 × 8

=

320

Check It, and What It Is Not

Check by dividing back. Multiplication and division undo each other, so 320 ÷ 8 = 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 × 8 is a number, not an area. If those are the sides of a room in feet, the answer is 320 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.

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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 × 8? (The answer is: 320). Enter the multiplicand (e.g. '40') and the multiplier (e.g. '8') and hit the button. The order of the two numbers does not matter — 40 × 8 and 8 × 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)

Products of 40

MultiplicationProduct
30 × 8240
31 × 8248
32 × 8256
33 × 8264
34 × 8272
35 × 8280
36 × 8288
37 × 8296
38 × 8304
39 × 8312
40 × 8320
41 × 8328
42 × 8336
43 × 8344
44 × 8352
45 × 8360
46 × 8368
47 × 8376
48 × 8384
49 × 8392

FAQ

What is 40 × 8?

40 × 8 = 320

Is 40 × 8 the same as 8 × 40?

Yes. Multiplication is commutative, so both come to 320. Only the working differs: this page multiplies by 8, which gives a single partial product.

How do you check that 40 × 8 = 320?

Divide the product back by one of the factors: 320 ÷ 8 = 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 × 8?

There is only one: the multiplier 8 has a single digit, so 40 × 8 = 320 is written straight under the line, with no addition step.

See Also