How rare? Which denomination?
Please check your bills again and post a new, separate question with the date and denomination. No US banknotes are dated 1958; the last silver certificates were 1957 $1 bills.
You do not specify the serial numbers, signatories or quantity. The last Australian One Dollar notes were put into circulation in 1982, and were progressively withdrawn from circulation from 1984 after the introduction of the One Dollar coin. Because they have consecutively numbered serial numbers, they are presumably in mint uncirculated condition. A quantity of consecutively numbered uncirculated banknotes in mint condition, depending on the serial numbers, could fetch anything from $7 to $925 AUD each. As a "range" of banknotes, they potentially have a higher value than might be expected for the single note value multiplied by the number of notes. A reputable coin dealer will be able to give a more accurate valuation.
A Bank of England Five Pound note (Series D - blue - Chief Cashier J.B. Page)(Duke of Wellington)(serial number 88D), uncirculated and in absolute mint condition could fetch anything up to £30 GBP. If it has been circulated but still in good condition, it might fetch anything from £8 to £15 GBP. A consecutively numbered pair uncirculated and in absolute mint condition would appeal to a number of collectors and potentially get significantly more. A reputable coin dealer will be able to give a more accurate valuation.
You do not give any detail like the country, the serial numbers, the signatories, the year, etc. They are worth Twenty Dollars at worst. Ten consecutively numbered banknotes in uncirculated condition would attract the interest of many banknote collectors.
An Australian 2001 Five Dollar note (MacFarlane/Evans)(serial DK01826180), uncirculated and in absolute mint condition could fetch up to $33 AUD. If it has been circulated but still in good condition, it might fetch anything from $6 to $14 AUD. A consecutively numbered wad would have a signifcantly higher value. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 2005 Five Dollar note (MacFarlane/Henry)(serial BA05 to KC05), uncirculated and in absolute mint condition could fetch up to $12 AUD. These notes are still in circulation. A set of 15 consecutively numbered uncirculated mint condition notes could fetch significantly more. A reputable coin dealer will be able to give a more accurate valuation.
64 and 65
Yes. The fact that they're consecutive doesn't add much to their value but an uncirculated 1969 $1 bill retails for about $2. Of course a dealer or collector will pay less because that's the selling price.
Numbered Consecutively.....now read your CDC books
Each number is one more than the previous.
You do not give any details of country, year or condition. If you refer to the Australian One Dollar note, which has been out of circulation for 25 years, and the notes are uncirculated and have consecutively numbered serial numbers, you probably have something of value. Take them to a reputable coin dealer for an accurate assessment and valuation.
A Bank of England 1967 Ten Shilling note (Series C - red/brown)(Chief Cashier - J S Fforde - serial 66Y), uncirculated and in absolute mint condition could fetch anything up to £14 GBP. If it has been circulated but still in good condition, it might fetch anything from £2 to £6 GBP. A consecutively numbered group in mint condition may fetch more. A reputable coin dealer will be able to give a more accurate valuation.