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While teaching, have some things up for auction on eBay!?
OR
Write your own practice problem book with helpful hints and tips you can sell to students on your own website or on an auction site.
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90 pennies 7 half dollars 2 quarters 1 dime
90 minutes take up 3/4 of 2 hours, the reasons being:There are 120 minutes in two hours, take 1/4 off 2 hours (30 mins), your answer is 90 minutes
4-1/2 hours
2 and a half hours is 90 seconds.
1 1/2 hours