Helpful tricks with basic 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 