Long Multiplication: 820 × 4

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

What is 820 × 4?

Answer

820 × 4 =
3,280

820 × 4 and 4 × 820 are the same product — the order of the factors never changes the answer, only the working. Below, 820 is multiplied by 4 in a column, digit by digit.

820 × 4 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.

  820
×   4
 3280
820 × 4 = 3,280

Step-by-Step Solution

Step 1: Multiply the multiplicand by the last digit of the multiplier, 4: 820 × 4 = 3,280.

  • 0 × 4 = 0. Write 0.
  • 2 × 4 = 8. Write 8.
  • 8 × 4 = 32. Write 2 and carry 3.
  • No digits are left, so the carried 3 is written in front: the partial product is 3,280.

820 × 4

=

3,280

Check It, and What It Is Not

Check by dividing back. Multiplication and division undo each other, so 3,280 ÷ 4 = 820 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.

820 × 4 is a number, not an area. If those are the sides of a room in feet, the answer is 3,280 square feet — the same arithmetic, a different question, and it is answered by the square footage calculator.

Related Calculations

See Also

Long Multiplication 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 820 × 4? (The answer is: 3,280). Enter the multiplicand (e.g. '820') and the multiplier (e.g. '4') and hit the button. The order of the two numbers does not matter — 820 × 4 and 4 × 820 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.
Recalculate with different values ↑

Products of 820

MultiplicationProduct
720 × 42,880
730 × 42,920
740 × 42,960
750 × 43,000
760 × 43,040
770 × 43,080
780 × 43,120
790 × 43,160
800 × 43,200
810 × 43,240
820 × 43,280
830 × 43,320
840 × 43,360
850 × 43,400
860 × 43,440
870 × 43,480
880 × 43,520
890 × 43,560
900 × 43,600
910 × 43,640

FAQ

What is 820 × 4?

820 × 4 = 3,280

Is 820 × 4 the same as 4 × 820?

Yes. Multiplication is commutative, so both come to 3,280. Only the working differs: this page multiplies by 4, which gives a single partial product.

How do you check that 820 × 4 = 3,280?

Divide the product back by one of the factors: 3,280 ÷ 4 = 820 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

What are the partial products of 820 × 4?

There is only one: the multiplier 4 has a single digit, so 820 × 4 = 3,280 is written straight under the line, with no addition step.

See Also