1821 Times (1821×) Multiplication Table
1821 times table, 1 to 20
| 1821 × 1 | 1,821 |
| 1821 × 2 | 3,642 |
| 1821 × 3 | 5,463 |
| 1821 × 4 | 7,284 |
| 1821 × 5 | 9,105 |
| 1821 × 6 | 10,926 |
| 1821 × 7 | 12,747 |
| 1821 × 8 | 14,568 |
| 1821 × 9 | 16,389 |
| 1821 × 10 | 18,210 |
| 1821 × 11 | 20,031 |
| 1821 × 12 | 21,852 |
| 1821 × 13 | 23,673 |
| 1821 × 14 | 25,494 |
| 1821 × 15 | 27,315 |
| 1821 × 16 | 29,136 |
| 1821 × 17 | 30,957 |
| 1821 × 18 | 32,778 |
| 1821 × 19 | 34,599 |
| 1821 × 20 | 36,420 |
Patterns that help you remember it
- The last digits repeat in a cycle of 10: 1, 2, 3, 4, 5, 6, 7, 8, 9, 0.
- Split it into tens and ones: 1821 × k = 1820 × k + 1 × k.
- Each answer is 1821 more than the one before, so you can count on in steps of 1821.
Building it from tables you already know
To multiply 1821 by 9, multiply by 10 and take one 1821 away: 18,210 − 1821 = 16,389. To multiply by 11, multiply by 10 and add one more 1821: 18,210 + 1821 = 20,031. Multiplying by 4 is doubling twice: 1821 → 3,642 → 7,284.
Every multiple of 1821 is at least 1821, so there are none below 100 and 0 below 1,000. A number is in the 1821 times table exactly when it divides by 1821 with no remainder.
Odd, even and the last digit
Because 1821 is odd, the answers alternate between odd and even: 1821 × 1 = 1821 is odd, 1821 × 2 = 3,642 is even, and so on. Multiplying by 10 always puts a zero on the end: 1821 × 10 = 18,210, and 1821 × 100 = 182,100. Multiplying by 5 is half of multiplying by 10: half of 18,210 is 9,105.
Using the 1821 times table to divide
Every fact also works backwards: because 1821 × 7 = 12,747, you know 12,747 ÷ 1821 = 7 and 12,747 ÷ 7 = 1821. Practising the table and its division facts together halves the work.
1821 times table practice worksheet
- 1821 × 8 = ______
- 1821 × 10 = ______
- 1821 × 9 = ______
- 1821 × 11 = ______
- 1821 × 10 = ______
- 1821 × 8 = ______
- 1821 × 2 = ______
- 1821 × 12 = ______
- 1821 × 8 = ______
- 1821 × 6 = ______
- 1821 × 3 = ______
- 1821 × 10 = ______
Answer key
- 14,568
- 18,210
- 16,389
- 20,031
- 18,210
- 14,568
- 3,642
- 21,852
- 14,568
- 10,926
- 5,463
- 18,210
Word problems
Times tables are most useful when you can spot them in a question. Try these, then open each one to check:
- A box holds 1821 pencils. How many pencils are in 9 boxes?
Answer
9 × 1821 = 16,389 pencils. - Tickets cost $1821 each. How much do 6 tickets cost?
Answer
6 × $1821 = $10,926. - 9,105 chairs are set out in rows of 1821. How many rows are there?
Answer
9,105 ÷ 1821 = 5 rows. - A plant grows 1821 millimetres a week. How much does it grow in 7 weeks?
Answer
7 × 1821 = 12,747 millimetres.
Questions
What is 1821 × 12?
21,852.
What is half of 1821 × 8?
1821 × 8 = 14,568, and half of that is 7,284, which is 1821 × 4. Halving one factor halves the answer.
What is 1821 times 0?
0. Any number multiplied by zero is zero, because zero groups of 1821 contain nothing.
What is 1821 × 7 and 1821 × 8?
1821 × 7 = 12,747 and 1821 × 8 = 14,568. These two are the facts most people find hardest, so they are worth practising on their own.
Is 27,315 in the 1821 times table?
Yes: 27,315 ÷ 1821 = 15 with no remainder. 27,316 is not, because dividing it by 1821 leaves a remainder of 1.
How do I learn the 1821 times table quickly?
Learn it in order first, then use the patterns above and practise mixed questions; a few minutes a day works better than one long session.