Long Multiplication: 21 × 7

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

What is 21 × 7?

Answer

21 × 7 =
147

One partial product: 21 × 7 = 147. 7 × 21 gives the same 147.

21 × 7 in a column

21
×7
147

In the column: product 147.

Step by step: 21 × 7

  1. Step 1Multiply the multiplicand by the last digit of the multiplier, 7: 21 × 7 = 147.
    • 1 × 7 = 7. Write 7.
    • 2 × 7 = 14. Write 4 and carry 1.
    • No digits are left, so the carried 1 is written in front: the partial product is 147.
  2. Product147

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Recalculate with different values ↑

Products of 21

MultiplicationProduct
11 × 777
12 × 784
13 × 791
14 × 798
15 × 7105
16 × 7112
17 × 7119
18 × 7126
19 × 7133
20 × 7140
21 × 7147
22 × 7154
23 × 7161
24 × 7168
25 × 7175
26 × 7182
27 × 7189
28 × 7196
29 × 7203
30 × 7210

FAQ

What is 21 × 7?

21 × 7 = 147

Is 21 × 7 the same as 7 × 21?

Yes. Multiplication is commutative, so both come to 147. Only the working differs: this page multiplies by 7, which gives a single partial product.

How do you check that 21 × 7 = 147?

Divide the product back by one of the factors: 147 ÷ 7 = 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 × 7?

There is only one: the multiplier 7 has a single digit, so 21 × 7 = 147 is written straight under the line, with no addition step.

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