Long Multiplication: 21 × 9

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

What is 21 × 9?

Answer

21 × 9 =
189

One partial product: 21 × 9 = 189. 9 × 21 gives the same 189.

21 × 9 in a column

21
×9
189

In the column: product 189.

Step by step: 21 × 9

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 9: 21 × 9 = 189.
    • 1 × 9 = 9. Write 9.
    • 2 × 9 = 18. Write 8 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 189.
  2. Product189

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 999
12 × 9108
13 × 9117
14 × 9126
15 × 9135
16 × 9144
17 × 9153
18 × 9162
19 × 9171
20 × 9180
21 × 9189
22 × 9198
23 × 9207
24 × 9216
25 × 9225
26 × 9234
27 × 9243
28 × 9252
29 × 9261
30 × 9270

FAQ

What is 21 × 9?

21 × 9 = 189

Is 21 × 9 the same as 9 × 21?

Yes. Multiplication is commutative, so both come to 189. Only the working differs: this page multiplies by 9, which gives a single partial product.

How do you check that 21 × 9 = 189?

Divide the product back by one of the factors: 189 ÷ 9 = 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 × 9?

There is only one: the multiplier 9 has a single digit, so 21 × 9 = 189 is written straight under the line, with no addition step.

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