Long Multiplication: 21 × 2

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

What is 21 × 2?

Answer

21 × 2 =
42

One partial product: 21 × 2 = 42. 2 × 21 gives the same 42.

21 × 2 in a column

21
×2
42

In the column: product 42.

Step by step: 21 × 2

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 2: 21 × 2 = 42.
    • 1 × 2 = 2. Write 2.
    • 2 × 2 = 4. Write 4.
  2. Product42

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 222
12 × 224
13 × 226
14 × 228
15 × 230
16 × 232
17 × 234
18 × 236
19 × 238
20 × 240
21 × 242
22 × 244
23 × 246
24 × 248
25 × 250
26 × 252
27 × 254
28 × 256
29 × 258
30 × 260

FAQ

What is 21 × 2?

21 × 2 = 42

Is 21 × 2 the same as 2 × 21?

Yes. Multiplication is commutative, so both come to 42. Only the working differs: this page multiplies by 2, which gives a single partial product.

How do you check that 21 × 2 = 42?

Divide the product back by one of the factors: 42 ÷ 2 = 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 × 2?

There is only one: the multiplier 2 has a single digit, so 21 × 2 = 42 is written straight under the line, with no addition step.

See Also