Part A
Answer: 33.2 degrees F
Explanation: Adding on a negative is the same as subtracting. So 72.3 + (-39.1) = 72.3 - 39.1 = 33.2
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Part B
Answer: 70 + <u> 2 </u> + <u> 0.3 </u> + (-30) + (-9) + ( <u> </u><u>-0.1 </u> )
Explanation:
Think of 72 as 70+2. Furthermore, think of 72.3 as 70+2+0.3; we just break the number up into its corresponding digits (adding zeros when needed). The 7 is in the tens place, the 2 is in the units or ones place, and the 3 is in the tenths place.
Similarly, we have 39.1 break down into 30+9+0.1, in which all three terms are made negative to represent -39.1
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Part C
Answer: 70 + (-30) + <u> 2 </u> + (-9) + <u>0.3</u> + ( <u>-0.1</u> )
Explanation: Arrange the tens place value items to be next to each other. Same goes for the units place value, and also the tenths place value.
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Part D
Answer: [70 + (-30)] + [ <u> 2 </u> + (-9) ] + [ <u>0.3</u> + ( <u>-0.1</u> ) ]
Explanation: Take the result of part C and surround each pair of terms in square brackets to show how the terms pair up.
