Long Multiplication: 420 × 2

"Long Multiplication Calculator" Calculator

Multiplicand (number to be multiplied)

Multiplier (number to multiply by)

What is 420 × 2?

Answer

420 × 2 = 840

420 × 2 and 2 × 420 are the same product — the order of the factors never changes the answer, only the working. Below, 420 is multiplied by 2 in a column, digit by digit.

420 × 2 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.

 420
×  2
 840
420 × 2 = 840

Step-by-Step Solution

Step 1: Multiply the multiplicand by the last digit of the multiplier, 2: 420 × 2 = 840.

  • 0 × 2 = 0. Write 0.
  • 2 × 2 = 4. Write 4.
  • 4 × 2 = 8. Write 8.

420 × 2

=

840

Check It, and What It Is Not

Check by dividing back. Multiplication and division undo each other, so 840 ÷ 2 = 420 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.

420 × 2 is a number, not an area. If those are the sides of a room in feet, the answer is 840 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 420 × 2? (The answer is: 840). Enter the multiplicand (e.g. '420') and the multiplier (e.g. '2') and hit the button. The order of the two numbers does not matter — 420 × 2 and 2 × 420 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 420

MultiplicationProduct
320 × 2640
330 × 2660
340 × 2680
350 × 2700
360 × 2720
370 × 2740
380 × 2760
390 × 2780
400 × 2800
410 × 2820
420 × 2840
430 × 2860
440 × 2880
450 × 2900
460 × 2920
470 × 2940
480 × 2960
490 × 2980
500 × 21,000
510 × 21,020

FAQ

What is 420 × 2?

420 × 2 = 840

Is 420 × 2 the same as 2 × 420?

Yes. Multiplication is commutative, so both come to 840. Only the working differs: this page multiplies by 2, which gives a single partial product.

How do you check that 420 × 2 = 840?

Divide the product back by one of the factors: 840 ÷ 2 = 420 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

What are the partial products of 420 × 2?

There is only one: the multiplier 2 has a single digit, so 420 × 2 = 840 is written straight under the line, with no addition step.

See Also