Magical Multiplication
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The document provides tips for multiplying numbers 0-12. It explains tricks for multiplying by each number, such as doubling for 2, cutting in half and dropping the decimal for odd numbers, cutting in half and adding a 0 for even numbers, and duplicating the number for 11. The tricks are intended to make multiplication easier to learn.
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Magical Multiplication
- 1. Magical Multiplication Created By: Kristin Genung Math 105
- 2. Learning To Multiply: A FEW MYSTIFYING TIPS
- 5. It’s as simple as that!! 0 x 1 = 0 0 x 2 = 0 0 x 3 = 0
- 8. 1’s 1 x 4 = 4 1 x 5 = 5 1 x 6 = 6
- 10. 2 times any number is that number doubled = + + 2 2 2 6 2 x 3 = 6
- 11. 2’s 2’s
- 12. Please, Please, Bring on the 3’s… 3’s
- 15. 4’s
- 16. 4’s
- 17. 4 x 1 = 4 ( 1 doubled is 2 and 2 doubled is 4 ) 4 x 2 = 8 ( 2 doubled is 4 and 4 doubled is 8 ) 4 x 3 = 12 ( 3 doubled is 6 and 6 doubled is 12 )
- 19. If you are multiplying by an odd number.. Cut the number you are multiplying by in half then drop the decimal
- 20. 5 x 3 = 15 ( half of 3 is 1.5, then drop decimal) 5 x 7 = 35 ( half of 7 is 3.5, then drop the decimal) 5 x 9 = 45 ( half of 9 is 4.5, then drop the decimal)
- 21. 5 If it is an even number… - Cut the number in half and add a 0
- 23. 6’s
- 25. Then multiply that number by ten.
- 27. 7’s
- 28. No need to be slick there isn’t a trick… 7 x 7 = 49 7 x 8 = 56
- 29. 8’s
- 30. Once again use the tricks.. 8 x 8 = 64
- 31. 9’s
- 32. Subtract 1 from the number you are multiplying by then add a second number that adds up to nine..
- 33. 9 x 7 = ( 7 – 1 = 6, 6 +3 = 9 so the answer is 63) 9 x 8 = ( 8 – 1 = 7, 7 +2 = 9 so the answer is 72) 9 x 9 = ( 9 – 1 = 8, 8 +1 = 9 so the answer is 81)
- 34. 10’s
- 35. Just add a 0 to the number you are multiplying by 10 x 2 = 20 10 x 3 = 30 10 x 4 = 40
- 36. 11’s
- 37. Any number 1-10 multiplied by 11 is just duplicated.
- 38. 11 x 3 = 33 (3 is multiplied by 11 so you just duplicate 3 side by side) 11 x 4 = 44 11 x 5 = 55
- 39. 12 were done…Now let’s have fun… Use your tricks 1-11 … And 12 x 12 = 144