Sumwise

644 Times (644×) Multiplication Table

644 times table, 1 to 20

644 × 1644
644 × 21,288
644 × 31,932
644 × 42,576
644 × 53,220
644 × 63,864
644 × 74,508
644 × 85,152
644 × 95,796
644 × 106,440
644 × 117,084
644 × 127,728
644 × 138,372
644 × 149,016
644 × 159,660
644 × 1610,304
644 × 1710,948
644 × 1811,592
644 × 1912,236
644 × 2012,880

Patterns that help you remember it

  • The last digits repeat in a cycle of 5: 4, 8, 2, 6, 0.
  • Every answer is even, because 644 is even.
  • Split it into tens and ones: 644 × k = 640 × k + 4 × k.
  • Each answer is 644 more than the one before, so you can count on in steps of 644.

Building it from tables you already know

Every answer in the 644 times table is double the answer in the 322 times table: 322 × 6 = 1,932, so 644 × 6 = 3,864. To multiply 644 by 9, multiply by 10 and take one 644 away: 6,440 − 644 = 5,796. To multiply by 11, multiply by 10 and add one more 644: 6,440 + 644 = 7,084. Multiplying by 4 is doubling twice: 644 → 1,288 → 2,576.

Every multiple of 644 is at least 644, so there are none below 100 and 1 below 1,000. A number is in the 644 times table exactly when it divides by 644 with no remainder.

Odd, even and the last digit

Because 644 is even, every answer in its table is even, which is a quick way to catch a wrong answer. Multiplying by 10 always puts a zero on the end: 644 × 10 = 6,440, and 644 × 100 = 64,400. Multiplying by 5 is half of multiplying by 10: half of 6,440 is 3,220.

Using the 644 times table to divide

Every fact also works backwards: because 644 × 7 = 4,508, you know 4,508 ÷ 644 = 7 and 4,508 ÷ 7 = 644. Practising the table and its division facts together halves the work.

644 times table practice worksheet

  1. 644 × 10 = ______
  2. 644 × 10 = ______
  3. 644 × 9 = ______
  4. 644 × 5 = ______
  5. 644 × 8 = ______
  6. 644 × 3 = ______
  7. 644 × 9 = ______
  8. 644 × 12 = ______
  9. 644 × 3 = ______
  10. 644 × 12 = ______
  11. 644 × 3 = ______
  12. 644 × 6 = ______
Answer key
  1. 6,440
  2. 6,440
  3. 5,796
  4. 3,220
  5. 5,152
  6. 1,932
  7. 5,796
  8. 7,728
  9. 1,932
  10. 7,728
  11. 1,932
  12. 3,864

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 644 pencils. How many pencils are in 3 boxes?
    Answer3 × 644 = 1,932 pencils.
  2. Tickets cost $644 each. How much do 8 tickets cost?
    Answer8 × $644 = $5,152.
  3. 5,152 chairs are set out in rows of 644. How many rows are there?
    Answer5,152 ÷ 644 = 8 rows.
  4. A plant grows 644 millimetres a week. How much does it grow in 8 weeks?
    Answer8 × 644 = 5,152 millimetres.

About this page

The table, the patterns and the practice questions are all calculated for 644 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 644 × 12?

7,728.

What is half of 644 × 8?

644 × 8 = 5,152, and half of that is 2,576, which is 644 × 4. Halving one factor halves the answer.

What is 644 times 0?

0. Any number multiplied by zero is zero, because zero groups of 644 contain nothing.

What is 644 × 7 and 644 × 8?

644 × 7 = 4,508 and 644 × 8 = 5,152. These two are the facts most people find hardest, so they are worth practising on their own.

Is 9,660 in the 644 times table?

Yes: 9,660 ÷ 644 = 15 with no remainder. 9,661 is not, because dividing it by 644 leaves a remainder of 1.

How do I learn the 644 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.