Adding and Subtracting Multiple Dollar Amounts

When deducting multiple dollar amounts from one larger dollar amount, you can either subtract each sum individually or add each sum together and subtract your result from the larger sum. This video shows detailed examples of each method.

Adding and Subtracting Multiple Dollar Amounts

Adding and Subtracting Multiple Dollar Amounts

Let’s look at an example of how to calculate a paycheck after deductions. Here, we’re told Allison’s monthly salary is $3,124.47. She has three deductions: Income tax of$538.63, federal insurance of $237.49, and health insurance of$159.53.

There are two ways you can go about calculating this. You can either subtract each term individually from the salary amount, or you can sum all the deductions and subtract that sum from the salary amount.

If you go to the first method you have three operations, three subtractions. If you go the second way you just have one addition and subtraction. We’re going to go with the second method.

To do this, we’re going to sum up all three deductions here. They are 538.63, 237.49, and 159.53. We’ll add these up. 3, 9, and 3 is 15.

Carry the 1. 1, 6, 4, 5 is 16. Carry another 1. 1, 8, 7, 9 is 25. Carry a 2. 2, 3, 3, 5 is 13. Carry a 1. 1, 5, 2, 1 is 9. All the deductions together are 935.65. We’ll subtract this number now from the salary.

We have 3,124.47 and we’re subtracting 935.65/ 5 out of 7 is 2. 6 out of 4, we’re going to have to borrow from this 4 so this becomes a 3. This becomes a 14. 6 from 14 is 8. 5 from 3, we are going to have to borrow again. We’ll take this down to 1 and this will become a 13.

5 from 13 is 8. 3 from 1, we’ll borrow again, this becomes zero. This becomes an 11. 3 from 11 is also 8. 9 from zero, borrow one more time, becomes a 2, that becomes a 10. 9 from 10 is 1. We have a 2 right there. Allison’s monthly paycheck amount is going to be \$2,188.82.

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