Basically if you know your addition just add the values of each coin or dollar bill. Just forget about the $ sign or cent sign when adding the values together. FOR EXAMPLE: $1 and $2.75 You would ignore dollar sign and add together like normal to get 3.75 But remember to add dollar sign back at the end. If the value only have 2 values with cents it should be something like 0.54 cents BUT NO DOLLAR SIGN Hope that helps