Sumwise

645 Times (645×) Multiplication Table

645 times table, 1 to 20

645 × 1645
645 × 21,290
645 × 31,935
645 × 42,580
645 × 53,225
645 × 63,870
645 × 74,515
645 × 85,160
645 × 95,805
645 × 106,450
645 × 117,095
645 × 127,740
645 × 138,385
645 × 149,030
645 × 159,675
645 × 1610,320
645 × 1710,965
645 × 1811,610
645 × 1912,255
645 × 2012,900

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: 645 × k = 640 × k + 5 × k.
  • Each answer is 645 more than the one before, so you can count on in steps of 645.

Building it from tables you already know

To multiply 645 by 9, multiply by 10 and take one 645 away: 6,450 − 645 = 5,805. To multiply by 11, multiply by 10 and add one more 645: 6,450 + 645 = 7,095. Multiplying by 4 is doubling twice: 645 → 1,290 → 2,580.

Every multiple of 645 is at least 645, so there are none below 100 and 1 below 1,000. A number is in the 645 times table exactly when it divides by 645 with no remainder.

Odd, even and the last digit

Because 645 is odd, the answers alternate between odd and even: 645 × 1 = 645 is odd, 645 × 2 = 1,290 is even, and so on. Multiplying by 10 always puts a zero on the end: 645 × 10 = 6,450, and 645 × 100 = 64,500. Multiplying by 5 is half of multiplying by 10: half of 6,450 is 3,225.

Using the 645 times table to divide

Every fact also works backwards: because 645 × 7 = 4,515, you know 4,515 ÷ 645 = 7 and 4,515 ÷ 7 = 645. Practising the table and its division facts together halves the work.

645 times table practice worksheet

  1. 645 × 10 = ______
  2. 645 × 5 = ______
  3. 645 × 7 = ______
  4. 645 × 4 = ______
  5. 645 × 9 = ______
  6. 645 × 5 = ______
  7. 645 × 11 = ______
  8. 645 × 1 = ______
  9. 645 × 12 = ______
  10. 645 × 6 = ______
  11. 645 × 8 = ______
  12. 645 × 7 = ______
Answer key
  1. 6,450
  2. 3,225
  3. 4,515
  4. 2,580
  5. 5,805
  6. 3,225
  7. 7,095
  8. 645
  9. 7,740
  10. 3,870
  11. 5,160
  12. 4,515

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 645 pencils. How many pencils are in 3 boxes?
    Answer3 × 645 = 1,935 pencils.
  2. Tickets cost $645 each. How much do 7 tickets cost?
    Answer7 × $645 = $4,515.
  3. 3,225 chairs are set out in rows of 645. How many rows are there?
    Answer3,225 ÷ 645 = 5 rows.
  4. A plant grows 645 millimetres a week. How much does it grow in 12 weeks?
    Answer12 × 645 = 7,740 millimetres.

About this page

The table, the patterns and the practice questions are all calculated for 645 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 645 × 12?

7,740.

What is half of 645 × 8?

645 × 8 = 5,160, and half of that is 2,580, which is 645 × 4. Halving one factor halves the answer.

What is 645 times 0?

0. Any number multiplied by zero is zero, because zero groups of 645 contain nothing.

What is 645 × 7 and 645 × 8?

645 × 7 = 4,515 and 645 × 8 = 5,160. These two are the facts most people find hardest, so they are worth practising on their own.

Is 9,675 in the 645 times table?

Yes: 9,675 ÷ 645 = 15 with no remainder. 9,676 is not, because dividing it by 645 leaves a remainder of 1.

How do I learn the 645 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.