Correct use of units is important in calculations. Sometimes, two plus two does not equal four, as in “two feet plus two inches equals....” Sometimes, 10 + 120 = , as in “10 min+120 sec = hour.” Sometimes... why don’t you see for yourself?

Fill the blank spaces with units (inches, dimes, hours, etc.) in a way that makes the addition examples correct. Try to invent more than one set of answers for each question.

Example: 1... + 1... = 3...
Possible solutions:
1 pint + 1 cup = 3 cups or
1 quarter + 1 eighth = 3 eighths or
1 dime + 1 nickel = 3 nickels

1. 3... + 2... = 32...
2. 3... + 2... = 23...
3. 3... + 2... = 17...
4. 3... + 2... = 35...
5. 3... + 2... = 182...
6. 3... + 2... = 123...

If the unit of the sum coincides with the unit of one of the addends (and let’s assume it is so), then it’s possible to find the relationship between the units of two addends.

Example:
In problem 1

1. Decades, years, years or
   dimes, pennies, pennies.
2. Weeks, days, days.
3. Days, weeks, days.
4. Weeks, weeks, days.
5. Hours, minutes, minutes or
   minutes, seconds, seconds.
6. Minutes, hours, minutes or
   seconds, minutes, seconds.

In all these problems, other answers may also be possible.