20 + 45 = 65
20 x 45 = 900
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65
Sum of 9 and 4 = 13 Difference of 9 and 4 = 5 Product = 13 x 5 = 65.
How about: 30 and 30
The product of a sum and a difference with 31 times 29 is:(30+1) x (30-1)sum to differencemakea product= 30² - 1²= 900 - 1= 899
(50 + 15) = 65 (50 x 15) = 750 1/50 + 1/15 = 13/150