Add and Subtract a Positive Number

SS NS 2.1G7.NS.1.b Add, subtract, Understand multiply, p + q as and the divide number with located decimals; a distance add q with from p, in the positive or negative direction depending on whether q is positive or negative. Show negative integers; subtract positive integers from negative that a number and its opposite have a sum of 0 (are additive inverses). nterpret sums of rational numbers integers; by describing and verify real-world the reasonableness contexts. of the results. UNDRLYNG SKLLS AND ONS: basic facts; meaning of negative numbers SS G7..3 Solve multi-step real-life and mathematical problems posed with positive and negative rational numbers in any form (whole numbers, fractions, and Add and Subtract a ositive Number Subtract a positive number: go left. You can use a number line to show positive and negative numbers. When you add a positive number, you look to the right and move forward. o subtract a positive number, you look to the left and move forward. subtract add Add a positive number: go this way. he first number is where you start from. x a m p x a m p l l 1 Find 2 5. Look at the number line. Start at 2. You need to add 5. Face right. he second addend is positive, so move forward 5 spaces. You end up at +3. So, 2 5 3. 2 add 5 Find 1 6. On the number line, start at 1. You need to subtract 6. Face left. he number you are subtracting is positive, so move forward 6 spaces. SL Associates, nc. All rights reserved. subtract 6 You end up at 7. So, 1 6 7. page 76 hapter 7 Lesson 2

R A 1. 3 4 7 2. 3 4 1 3. 4 1 3 4. 7 3 4 5. 9 8 1 6. 1 3 2 7. 3 0 3 8. 3 2 1 9. 5 11 6 10. 8 15 7 11. 9 6 3 12. 10 9 1 13. 3 4 1 14. 5 4 9 15. 7 6 1 16. 7 12 5 17. 8 8 0 18. 6 4 10 19. 1 8 9 20. 6 12 6 21. 2 2 4 22. 7 2 9 23. 10 17 7 24. 10 20 10 SL Associates, nc. All rights reserved. 25. he temperature was 2. hen it rose 6 degrees. 2 6 4 26. he temperature was 2 F. hen it fell 6 degrees. ircle the correct choice. xplain how you decided. 2 6 8 F 27. Laara had a balance of $56 on her charge account. She paid off $30. A $56 $30 $86 $56 $30 $86 B $56 $30 $26 D $56 $30 $26 28. risha said, When you add a positive number to another number, you can never get a result that is less than 0. Sandi said, You can get a result that is less than zero, but the result is always greater than what you started with. Who is right? xplain your reasoning. Sandi is right, risha is not. f you start with a negative number and add a smaller positive number, you can get a negative result. hapter 7 Lesson 2 page 77

R A at home! 1. 3 2 5 2. 3 2 1 3. 4 3 1 4. 3 3 0 5. 9 7 2 6. 1 6 5 7. 5 0 5 8. 3 9 6 9. 5 4 1 10. 8 12 4 11. 8 6 2 12. 10 7 3 13. 3 2 1 14. 5 3 8 15. 8 6 2 16. 7 9 2 17. 8 9 1 18. 6 2 8 19. 1 5 6 20. 6 10 4 21. 4 4 8 22. 7 1 8 23. 10 12 2 24. 15 20 5 25. he temperature was 5. hen it rose 8 degrees. 5 8 3 26. he temperature was 5 F. hen it fell 8 degrees. ircle the correct choice. xplain how you decided. 5 8 13 F 27. Mia had a balance of $43 on her bank account. She paid off $25. A $43 $25 $68 $43 $25 $68 B $43 $25 $18 D $43 $25 $18 28. Lynn said, When you add a negative number to another number, you can never get a result that is greater than 0. Sandi said, You can get a result that is greater than zero, but the result is always less than what you started with. Who is right? xplain your reasoning. Sandi is correct. f she starts with 2 and adds 4, she gets 2 which is less than 4. f she starts with 2 and adds any number, she will have 2 less each time. page 52 Home Resource and Homework hapter 7 Lesson 2 SL Associates, nc. All rights reserved.