Questions: The billing department at a toy company sent out 60 invoices on Monday, 83 invoices on Tuesday, 104 invoices on Wednesday, 40 invoices on Thursday, and 86 invoices on Friday. How many invoices were sent out in this 5-day period? Estimate using front end rounding. How many invoices were sent out?

Solution Steps

To find the total number of invoices sent out in the 5-day period, we need to sum the number of invoices sent each day. For the estimation using front-end rounding, we round each number to the nearest ten and then sum them.

To find the total number of invoices sent out in the 5-day period, we sum the number of invoices sent each day: \[ 60 + 83 + 104 + 40 + 86 = 373 \]

For the estimation using front-end rounding, we round each number to the nearest ten and then sum them: \[ 60 \rightarrow 60 \\ 83 \rightarrow 80 \\ 104 \rightarrow 100 \\ 40 \rightarrow 40 \\ 86 \rightarrow 90 \] Summing these rounded numbers: \[ 60 + 80 + 100 + 40 + 90 = 370 \]

Final Answer