Addition
5 + 9
14
27 - 5
22
7 x 6
42
What's my name?
What is Theodore or Theo? (Teddy is negative a million points)
70 + 23
93
46 - 21
25
14 x 19
266
What's a motivation for studying mental math?
Judges decision.
64 + 29
93
94 - 76
18
2 x 43
86
Describe the trick for multiplying numbers between 10 and 20. You can use 14 x 16 as an example.
Judges decision.
144 + 56
200
24 - 60
-36
11 x 94
1034
What is the compliment of 43?
57
987 + 456
1443
912-456
456
22 x 67
1474
What is the name of the "Mathemagician" who inspired the ideas in this talk?
Dr. Arthur Benjamin