Gas is $2.09 per gallon; how much will it cost to get 10 gallons of gas? $20.90 $12.09 $7.91 $4.10

It's 20.90 because you just move the decimal point back one when multiplying by 10

Per gallon means that $2.09 is the price for 1 gallon.

$2.09 * 10 gallons= $20.90
Remember that to multiply by 10, you can just move the decimal one place value to the left.

Final $20.90

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