Open Middle®
Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the biggest/smallest product.
Hint
In order to make the biggest/smallest product, which numbers should we use?
Answer
Biggest Product: (9+6)(8+7)
Smallest Product: (1+2)(3+4)
Smallest Product: (1+2)(3+4)
Source: Nanette Johnson
when it says biggest/smallest I assumed there would be an answer for the biggest and the smallest
Thank you for pointing that out. We will add the smallest product…how did you get your answer for the smallest? Did you get a smaller answer? =)
(5+4) (6+4)
(1+2)+(3+4)
(2+4)(6+8)
sorry I meant (1+2)(3+4)
(8+5)(4+5)
(1*8)(2*4)
(5+7)(8+6)=
12×14=168
(1+9)(2+8)
(1+2)(2+0)
(9+6)(8+7)
(1+2)(3+4)
(9+6)(8+7)
(9+6) + (8+7) = 30
(1+2) + (3+4) =10
(-9 + -6)(-7 + -8)
Largest: (9+8) x (6+7) = 17 x 13 = 221