Hi Bonnie,
I can get you started by asking "Where do you put the 5?"
If the 5 is here
_ _ 5 = _ _
then the last digit on the right is either a 5 or a 0. A 0 is not allowed and neither is a second 5.
If the 5 is here
5 _ = _ _
or
_ 5 = _ _
then again the last digit on the right is either a 0 or a 5, both of which you can't have.
If the 5 is here
5_ _ = _ _
then the number on the right of the equal sign would be a three digit number, not a two digit number.
Thus either the 5 is here
_ _ _ = 5 _
or here
_ _ = 5 _
Hence in one of the equations the number on the right is 51, 52, 53, 54, 55, 56, 57, 58 or 59.
In an orderly way see how you can write each of these as a product of two 1 digit numbers or a 1 digit number times a 2 digit number with no digit repeated, and then see if you can form the second equation from the remaining digits.
Penny
