Long Multiplication: 21 × 5

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

What is 21 × 5?

Answer

21 × 5 =
105

One partial product: 21 × 5 = 105. 5 × 21 gives the same 105.

21 × 5 in a column

21
×5
105

In the column: product 105.

Step by step: 21 × 5

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 5: 21 × 5 = 105.
    • 1 × 5 = 5. Write 5.
    • 2 × 5 = 10. Write 0 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 105.
  2. Product105

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 555
12 × 560
13 × 565
14 × 570
15 × 575
16 × 580
17 × 585
18 × 590
19 × 595
20 × 5100
21 × 5105
22 × 5110
23 × 5115
24 × 5120
25 × 5125
26 × 5130
27 × 5135
28 × 5140
29 × 5145
30 × 5150

FAQ

What is 21 × 5?

21 × 5 = 105

Is 21 × 5 the same as 5 × 21?

Yes. Multiplication is commutative, so both come to 105. Only the working differs: this page multiplies by 5, which gives a single partial product.

How do you check that 21 × 5 = 105?

Divide the product back by one of the factors: 105 ÷ 5 = 21 exactly, with no remainder. Multiplication and division undo each other, which is what makes this check work.

What are the partial products of 21 × 5?

There is only one: the multiplier 5 has a single digit, so 21 × 5 = 105 is written straight under the line, with no addition step.

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