+0  
 
+1
199
2
avatar

https://gyazo.com/f148d753b8b48713cad5e440324b08ff

 May 22, 2018
 #1
avatar+225 
+1

the answer is either 5 or 6

 May 22, 2018
 #2
avatar+3849 
+2

Total: 2*2=4, 2*4=8, 2*7=14, 2*9=18

4*2=8. 4*4=16, 4*7=28, 4*9=36

7*2= 14, 7*4=28, 7*7=49, 7*9=63

9*2=18, 9*4=36, 9*7=63 9*9=81

 

2*7 works, 2*9 works, 4*4 works, 7*2, and 9*2 works.

Thus, \(\boxed{5}\) values.

 May 22, 2018

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