Long Multiplication: 21 × 4

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

What is 21 × 4?

Answer

21 × 4 =
84

One partial product: 21 × 4 = 84. 4 × 21 gives the same 84.

21 × 4 in a column

21
×4
84

In the column: product 84.

Step by step: 21 × 4

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 4: 21 × 4 = 84.
    • 1 × 4 = 4. Write 4.
    • 2 × 4 = 8. Write 8.
  2. Product84

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 444
12 × 448
13 × 452
14 × 456
15 × 460
16 × 464
17 × 468
18 × 472
19 × 476
20 × 480
21 × 484
22 × 488
23 × 492
24 × 496
25 × 4100
26 × 4104
27 × 4108
28 × 4112
29 × 4116
30 × 4120

FAQ

What is 21 × 4?

21 × 4 = 84

Is 21 × 4 the same as 4 × 21?

Yes. Multiplication is commutative, so both come to 84. Only the working differs: this page multiplies by 4, which gives a single partial product.

How do you check that 21 × 4 = 84?

Divide the product back by one of the factors: 84 ÷ 4 = 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 × 4?

There is only one: the multiplier 4 has a single digit, so 21 × 4 = 84 is written straight under the line, with no addition step.

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