Magical Multiplication

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Helpful tricks with basic multiplication

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  • This is a great resource, but has grammatical errors. Can you please fix slide 1? You are missing a comma and have the wrong "your". Thanks!
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Magical Multiplication

  1. 1. Magical Multiplication<br />Created By: Kristin Genung<br />Math 105<br />
  2. 2. Learning To Multiply:<br />A FEW MYSTIFYING TIPS<br />
  3. 3.
  4. 4.
  5. 5. It’s as simple as that!!<br />0 x 1 = 0<br />0 x 2 = 0<br />0 x 3 = 0<br />
  6. 6.
  7. 7.
  8. 8. 1’s<br />1 x 4 = 4<br />1 x 5 = 5<br />1 x 6 = 6<br />
  9. 9.
  10. 10. 2 times any number is that number doubled<br />=<br />+<br />+<br />2<br />2<br />2<br />6<br />2 x 3 = 6<br />
  11. 11. 2’s<br />2’s<br />
  12. 12. Please, Please, Bring on the 3’s…<br />3’s<br />
  13. 13.
  14. 14.
  15. 15. 4’s<br />
  16. 16. 4’s<br />
  17. 17. 4 x 1 = 4 ( 1 doubled is 2 and 2 doubled is 4 )<br />4 x 2 = 8 ( 2 doubled is 4 and 4 doubled is 8 )<br />4 x 3 = 12 ( 3 doubled is 6 and 6 doubled is 12 )<br />
  18. 18.
  19. 19. If you are multiplying by an odd number..<br />Cut the number you are multiplying by in half then drop the decimal <br />
  20. 20. 5 x 3 = 15 ( half of 3 is 1.5, then drop decimal)<br />5 x 7 = 35 ( half of 7 is 3.5, then drop the decimal)<br />5 x 9 = 45 ( half of 9 is 4.5, then drop the decimal)<br />
  21. 21. 5<br />If it is an even number…<br />- Cut the number in half and add a 0<br />
  22. 22.
  23. 23. 6’s<br />
  24. 24. <ul><li>Take the number your multiplying by and divide it in half.
  25. 25. Then multiply that number by ten.
  26. 26. Then add the original number you are multiplying by. </li></li></ul><li>6 x 6 = 36 <br />Half of 6 = 3 multiplied by 10 equals 30 then add 6 and you get 36. <br />6 x 7 = 42 <br />Half of 7 is 3.5 multiplied by 10 equals 35 then add 7 and you get 42.<br />6 x 8 = 48<br />Half of 8 is 4 multiplied by 10 equals 40 then add 8 and you get 48.<br />
  27. 27. 7’s<br />
  28. 28. No need to be slick there isn’t a trick…<br />7 x 7 = 49<br />7 x 8 = 56<br />
  29. 29. 8’s<br />
  30. 30. Once again use the tricks.. <br />8 x 8 = 64<br />
  31. 31. 9’s<br />
  32. 32. Subtract 1 from the number you are multiplying by then add a second number that adds up to nine..<br />
  33. 33. 9 x 7 = ( 7 – 1 = 6, 6 +3 = 9 so the answer is 63)<br />9 x 8 = ( 8 – 1 = 7, 7 +2 = 9 so the answer is 72)<br />9 x 9 = ( 9 – 1 = 8, 8 +1 = 9 so the answer is 81)<br />
  34. 34. 10’s<br />
  35. 35. Just add a 0 to the number <br />you are multiplying by<br />10 x 2 = 20 <br />10 x 3 = 30<br />10 x 4 = 40<br />
  36. 36. 11’s<br />
  37. 37. Any number 1-10 multiplied by 11 is just duplicated.<br />
  38. 38. 11 x 3 = 33<br />(3 is multiplied by 11 so you just duplicate 3 side by side) <br />11 x 4 = 44<br />11 x 5 = 55<br />
  39. 39. 12 were done…Now let’s have fun…<br /> Use your tricks 1-11 …<br /> And 12 x 12 = 144 <br />

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