Sumwise

1645 Times (1645×) Multiplication Table

1645 times table, 1 to 20

1645 × 11,645
1645 × 23,290
1645 × 34,935
1645 × 46,580
1645 × 58,225
1645 × 69,870
1645 × 711,515
1645 × 813,160
1645 × 914,805
1645 × 1016,450
1645 × 1118,095
1645 × 1219,740
1645 × 1321,385
1645 × 1423,030
1645 × 1524,675
1645 × 1626,320
1645 × 1727,965
1645 × 1829,610
1645 × 1931,255
1645 × 2032,900

Patterns that help you remember it

  • The last digits repeat in a cycle of 2: 5, 0.
  • Every answer ends in 0 or 5.
  • Split it into tens and ones: 1645 × k = 1640 × k + 5 × k.
  • Each answer is 1645 more than the one before, so you can count on in steps of 1645.

Building it from tables you already know

To multiply 1645 by 9, multiply by 10 and take one 1645 away: 16,450 − 1645 = 14,805. To multiply by 11, multiply by 10 and add one more 1645: 16,450 + 1645 = 18,095. Multiplying by 4 is doubling twice: 1645 → 3,290 → 6,580.

Every multiple of 1645 is at least 1645, so there are none below 100 and 0 below 1,000. A number is in the 1645 times table exactly when it divides by 1645 with no remainder.

Odd, even and the last digit

Because 1645 is odd, the answers alternate between odd and even: 1645 × 1 = 1645 is odd, 1645 × 2 = 3,290 is even, and so on. Multiplying by 10 always puts a zero on the end: 1645 × 10 = 16,450, and 1645 × 100 = 164,500. Multiplying by 5 is half of multiplying by 10: half of 16,450 is 8,225.

Using the 1645 times table to divide

Every fact also works backwards: because 1645 × 7 = 11,515, you know 11,515 ÷ 1645 = 7 and 11,515 ÷ 7 = 1645. Practising the table and its division facts together halves the work.

1645 times table practice worksheet

  1. 1645 × 12 = ______
  2. 1645 × 11 = ______
  3. 1645 × 9 = ______
  4. 1645 × 11 = ______
  5. 1645 × 10 = ______
  6. 1645 × 10 = ______
  7. 1645 × 2 = ______
  8. 1645 × 8 = ______
  9. 1645 × 5 = ______
  10. 1645 × 3 = ______
  11. 1645 × 9 = ______
  12. 1645 × 11 = ______
Answer key
  1. 19,740
  2. 18,095
  3. 14,805
  4. 18,095
  5. 16,450
  6. 16,450
  7. 3,290
  8. 13,160
  9. 8,225
  10. 4,935
  11. 14,805
  12. 18,095

Word problems

Times tables are most useful when you can spot them in a question. Try these, then open each one to check:

  1. A box holds 1645 pencils. How many pencils are in 5 boxes?
    Answer5 × 1645 = 8,225 pencils.
  2. Tickets cost $1645 each. How much do 7 tickets cost?
    Answer7 × $1645 = $11,515.
  3. 4,935 chairs are set out in rows of 1645. How many rows are there?
    Answer4,935 ÷ 1645 = 3 rows.
  4. A plant grows 1645 millimetres a week. How much does it grow in 10 weeks?
    Answer10 × 1645 = 16,450 millimetres.

About this page

The table, the patterns and the practice questions are all calculated for 1645 when the page is opened, so every fact on it is exact. Use the options above the worksheet to change the number of questions or the largest multiplier.

Questions

What is 1645 × 12?

19,740.

What is half of 1645 × 8?

1645 × 8 = 13,160, and half of that is 6,580, which is 1645 × 4. Halving one factor halves the answer.

What is 1645 times 0?

0. Any number multiplied by zero is zero, because zero groups of 1645 contain nothing.

What is 1645 × 7 and 1645 × 8?

1645 × 7 = 11,515 and 1645 × 8 = 13,160. These two are the facts most people find hardest, so they are worth practising on their own.

Is 24,675 in the 1645 times table?

Yes: 24,675 ÷ 1645 = 15 with no remainder. 24,676 is not, because dividing it by 1645 leaves a remainder of 1.

How do I learn the 1645 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.