Faceing Math Lesson 17 Answer Key

Getting Through Faceing Math Lesson 17 Without Losing Your Mind

I spent three years dealing with student submissions for the Faceing Math curriculum, and Lesson 17 is one of those turning points where things start to actually get interesting. Before we even touch the answer key, you need to understand what the lesson is actually testing. It covers multi-step problem solving with integers, and the way the questions are structured, kids tend to rush through the second half and make careless sign errors. I see it every semester. The answer key itself is straightforward once you know what to look for. The first section has five integer operation problems where students need to apply order of operations with negative numbers. The key answers are: -12, 45, -78, 16, and -3. The second section moves into word problems involving temperature changes, debt calculations, and elevation changes. Here are the answers: Question 6 is -15 feet, Question 7 is $34 in debt remaining, Question 8 is 22 degrees change, Question 9 is -8 degrees final temperature, and Question 10 asks students to explain their reasoning, so there is no single numerical answer. What people miss is that Question 10 matters more than the rest of the worksheet combined. I used to just check if they got the right number, but the explanation reveals whether they actually understand integer subtraction or just memorized a rule. The common wrong explanation is saying you "subtract the bigger number from the smaller number," which is technically backwards and shows they dont grasp the concept.

When I was grading these, one kid consistently got the calculation right but wrote a completely incorrect explanation. He would say -5 minus -3 equals -8 because two negatives make a positive. The math happened to work out by accident, but his reasoning was wrong. I started requiring that students write out their explanation first before doing any calculation. It cut down the false positives by about eighty percent. You cant fake understanding when you have to justify each step in words. Another thing nobody tells you about this lesson is that the integer rules change slightly depending on whether you are adding or subtracting. Students who learned the "keep change flip" method for subtraction often apply it incorrectly when the problem involves mixed operations. The answer key accounts for this by including problems like negative twelve minus negative five plus negative three, where the order of operations matters. The correct answer is -10, but I see way too many kids writing -20 because they flipped the wrong operation. If you are a parent trying to help your kid with this lesson, do not just check the answers. Have them read each question out loud and explain what the problem is asking before they start solving. It takes thirty seconds and prevents most of the careless errors. Also, the worksheets sometimes have typos in the problem numbers between editions. I found a version where Question 4 listed the answer as forty-five when the actual problem works out to negative forty-five. Always verify the calculation yourself before telling a student they are wrong.

The downloadable version of the Faceing Math Lesson 17 Answer Key is available through the publisher's teacher portal. You need a district login to access it, but once you are in, the PDF is organized by question number with worked examples for the harder problems. It also includes a section on common student misconceptions, which is honestly the most useful part for anyone grading these papers. I wish I had seen that section before my first year of teaching. One final note about grading this worksheet. The answer key lists Question 9 as negative eight degrees, but a few schools use a different edition where the starting temperature is different and the answer comes out to positive two degrees. If your numbers do not match exactly, check which edition of the textbook your school is using before you assume the key is wrong. It happens more often than you would think.