Technically Marley has zero dimes since she didn't bring any to the bank. However, since 10 pennies equals 1 dime, you would take the 290 (which is the total amount of pennies) and divide it by 10 (which is the the value of one dime) to get your answer of 29 dimes. You can check this by taking 29 and multiplying it by 10 to get the answer of 290. I hope this helps.