To find the annual amount from monthly wages, which number should be used for multiplication?

To convert monthly wages into an annual figure, it's essential to recognize that there are 12 months in a year. Therefore, the monthly wage should be multiplied by 12 to accurately project the total income over the course of a year.

Using 12 reflects the correct accounting for all months: January, February, March, and so forth, up to December. This approach ensures that the annual total comprises every month's income, rather than omitting any part of the year or inaccurately inflating the income.

The other numbers are not suitable because they either underestimate or overestimate the total time frame of a year. For instance, multiplying by 10 would not account for all the months, leading to a significant shortfall in the annual income representation. Similar reasoning applies to multiplying by 11 or 13, both of which do not accurately represent the complete annual earnings when based on monthly figures.