Computing the cost of telegrams, postage, expressage, for a real message or package, from the published tariffs.
Computing costs from mail order catalogues and the like.
Samples of Desirable Applications of Arithmetic where the Situation is Not Present to Sense
The samples given here all concern the subtraction of fractions. Samples concerning any other arithmetical principle may be found in the appropriate pages of any text which contains problem-material selected with consideration of life's needs.
A
1. Dora is making jelly. The recipe calls for 24 cups of sugar and she has only 21½. She has no time to go to the store so she has to borrow the sugar from a neighbor. How much must she get?
Subtract
| 24 | Think "½ and ½ = 1." Write ½. |
| 21½ | Think "2 and 2 = 4." Write the 2. |
| ——— | |
| 2½ |
2. A box full of soap weighs 29½ lb. The empty box weighs 3½ lb. How much does the soap alone weigh?