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Q: Why it is necessary to include a unit after a number?

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The unit of measurement

the unit of mesurement

the unit of mesurement

A pure number: ai integer, a rational number, an irrational number. 7.3, for example, does not include a metric prefix.

a unit of measurement along with the number

1/3 x 450 = 150. If the number refers to a unit of currency, don't forget to round to include the appropriate currency symbol and round to the correct number of decimal places if necessary.

Because all measurements are counts in terms of a units. For example, 3 minutes is less 2 hours even though 3 is not less than 2.

For a measurement to be useful, it must contain both a number and a unit.

We need to know the "unit of measure" ( ie metre, gram etc) and the number of units.ie 10 (No of Units) Metre (Unit of measure)

7.10 + 7.80 = 14.90. If the number refers to a unit of currency, don't forget to include the appropriate currency unit. If the number does not refer to a unit of currency, then the final trailing zero is unnecessary.

Without a given unit, you can not make that number through a feet stick. You need to include a unit in order to indicate the number on the stick.

34.96 + 1.58 = 36.54. If the number refers to a unit of currency, don't forget to include the appropriate currency unit.

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