Long Multiplication: 21 × 8

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

What is 21 × 8?

Answer

21 × 8 =
168

One partial product: 21 × 8 = 168. 8 × 21 gives the same 168.

21 × 8 in a column

21
×8
168

In the column: product 168.

Step by step: 21 × 8

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 8: 21 × 8 = 168.
    • 1 × 8 = 8. Write 8.
    • 2 × 8 = 16. Write 6 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 168.
  2. Product168

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 888
12 × 896
13 × 8104
14 × 8112
15 × 8120
16 × 8128
17 × 8136
18 × 8144
19 × 8152
20 × 8160
21 × 8168
22 × 8176
23 × 8184
24 × 8192
25 × 8200
26 × 8208
27 × 8216
28 × 8224
29 × 8232
30 × 8240

FAQ

What is 21 × 8?

21 × 8 = 168

Is 21 × 8 the same as 8 × 21?

Yes. Multiplication is commutative, so both come to 168. Only the working differs: this page multiplies by 8, which gives a single partial product.

How do you check that 21 × 8 = 168?

Divide the product back by one of the factors: 168 ÷ 8 = 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 × 8?

There is only one: the multiplier 8 has a single digit, so 21 × 8 = 168 is written straight under the line, with no addition step.

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