Sumwise

640 Times (640×) Multiplication Table

640 times table, 1 to 20

640 × 1640
640 × 21,280
640 × 31,920
640 × 42,560
640 × 53,200
640 × 63,840
640 × 74,480
640 × 85,120
640 × 95,760
640 × 106,400
640 × 117,040
640 × 127,680
640 × 138,320
640 × 148,960
640 × 159,600
640 × 1610,240
640 × 1710,880
640 × 1811,520
640 × 1912,160
640 × 2012,800

Patterns that help you remember it

  • The last digits repeat in a cycle of 1: 0.
  • Every answer is even, because 640 is even.
  • Every answer ends in 0 or 5.
  • Split it into tens and ones: 640 × k = 640 × k + 0 × k.
  • Each answer is 640 more than the one before, so you can count on in steps of 640.

Building it from tables you already know

Every answer in the 640 times table is double the answer in the 320 times table: 320 × 6 = 1,920, so 640 × 6 = 3,840. To multiply 640 by 9, multiply by 10 and take one 640 away: 6,400 − 640 = 5,760. To multiply by 11, multiply by 10 and add one more 640: 6,400 + 640 = 7,040. Multiplying by 4 is doubling twice: 640 → 1,280 → 2,560.

Every multiple of 640 is at least 640, so there are none below 100 and 1 below 1,000. A number is in the 640 times table exactly when it divides by 640 with no remainder.

Odd, even and the last digit

Because 640 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: 640 × 10 = 6,400, and 640 × 100 = 64,000. Multiplying by 5 is half of multiplying by 10: half of 6,400 is 3,200.

Using the 640 times table to divide

Every fact also works backwards: because 640 × 7 = 4,480, you know 4,480 ÷ 640 = 7 and 4,480 ÷ 7 = 640. Practising the table and its division facts together halves the work.

640 times table practice worksheet

  1. 640 × 10 = ______
  2. 640 × 12 = ______
  3. 640 × 6 = ______
  4. 640 × 11 = ______
  5. 640 × 6 = ______
  6. 640 × 10 = ______
  7. 640 × 10 = ______
  8. 640 × 11 = ______
  9. 640 × 6 = ______
  10. 640 × 10 = ______
  11. 640 × 1 = ______
  12. 640 × 9 = ______
Answer key
  1. 6,400
  2. 7,680
  3. 3,840
  4. 7,040
  5. 3,840
  6. 6,400
  7. 6,400
  8. 7,040
  9. 3,840
  10. 6,400
  11. 640
  12. 5,760

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 640 pencils. How many pencils are in 4 boxes?
    Answer4 × 640 = 2,560 pencils.
  2. Tickets cost $640 each. How much do 6 tickets cost?
    Answer6 × $640 = $3,840.
  3. 3,200 chairs are set out in rows of 640. How many rows are there?
    Answer3,200 ÷ 640 = 5 rows.
  4. A plant grows 640 millimetres a week. How much does it grow in 11 weeks?
    Answer11 × 640 = 7,040 millimetres.

About this page

The table, the patterns and the practice questions are all calculated for 640 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 640 × 12?

7,680.

What is half of 640 × 8?

640 × 8 = 5,120, and half of that is 2,560, which is 640 × 4. Halving one factor halves the answer.

What is 640 times 0?

0. Any number multiplied by zero is zero, because zero groups of 640 contain nothing.

What is 640 × 7 and 640 × 8?

640 × 7 = 4,480 and 640 × 8 = 5,120. These two are the facts most people find hardest, so they are worth practising on their own.

Is 9,600 in the 640 times table?

Yes: 9,600 ÷ 640 = 15 with no remainder. 9,601 is not, because dividing it by 640 leaves a remainder of 1.

How do I learn the 640 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.