Discussion





Unit
Next Larger Unit

16 ounces
1 pint


2 pints
1 quart


4 quarts
1 gallon










This is just like adding regular numbers except that you don't carry when

your partial sum is 10 or larger, you carry when you have reached the number

of smaller units included in one of the next larger units.









Solution









  5 gal 2 qt 1 pt 7 oz 

+ 1 gal 1 qt 1 pt 9 oz







7 oz plus 9 oz = 16 oz, so the result is 0 oz, carry 1 pint





1 pt plus 1 pt = 2 pts plus the 1 pt carry = 3 pints, result 1 pint,

carry 1 quart





2 qt plus 1 qt = 3 qt plus the 1 qt carry = 4 qt, result 0 qt, carry 1 gallon





5 gal plus 1 gal = 6 gal plus the 1 gal carry = 7 gal









  1     1    1

  5 gal 2 qt 1 pt 7 oz 

+ 1 gal 1 qt 1 pt 9 oz

----------------------

  7     0    1    0







Final result:  7 gal, 1 pt

 

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