Key Concept: Subtract Integers Example 1: Subtract Positive Integers Main Idea NGSSS Key Concept: Subtract Integers Example 1: Subtract Positive Integers Example 2: Subtract Positive Integers Example 3: Subtract Negative Integers Example 4: Subtract Negative Integers Example 5: Evaluate an Expression Example 6: Real-World Example Five-Minute Check Lesson Menu

Use the rules for subtracting integers. Main Idea/Vocabulary

MA.7.A.3.1 Use and justify the rules for adding, subtracting, multiplying, dividing, and finding the absolute value of integers. Also addresses MA.7.A.3.2. NGSSS

Key Concept

Subtract Positive Integers Find 2 – 15. 2 – 15 = 2 + (–15) To subtract 15, add –15. = –13 Simplify. Answer: –13 Example 1

Find 4 – 11. A. –15 B. –7 C. 7 D. 15 Example 1 CYP

Subtract Positive Integers Find –13 – 8. –13 – 8 = –13 + (–8) To subtract 8, add –8. = –21 Simplify. Answer: –21 Example 2

Find –22 – 2. A. 24 B. 20 C. –20 D. –24 Example 2 CYP

Subtract Negative Integers Find 12 – (–6). 12 – (–6) = 12 + 6 To subtract –6, add 6. = 18 Simplify. Answer: 18 Example 3

Find 4 – (–13). A. –17 B. –9 C. 9 D. 17 Example 3 CYP

Subtract Negative Integers Find –21 – (–8). –21 – (–8) = –21 + 8 To subtract –8, add 8. = –13 Simplify. Answer: –13 Example 4

Find –8 – (–1). A. 9 B. 7 C. –7 D. –9 Example 4 CYP

Evaluate an Expression ALGEBRA Evaluate g – h if g = –2 and h = –7. g – h = –2 – (–7) Replace g with –2 and h with –7. = –2 + (7) To subtract –7, add 7. = 5 Simplify. Answer: 5 Example 5

ALGEBRA Evaluate f – x if f = –1 and x = –9. C. –8 D. –10 Example 5 CYP

Subtract the lower temperature from the higher temperature. GEOGRAPHY In Mongolia, the temperature can fall to –45°C in January. The temperature in July may reach 40°C. Find the difference between these two temperatures in Mongolia. Subtract the lower temperature from the higher temperature. 40 – (–45) = 40 + 45 To subtract –45, add 45. = 85 Simplify. Answer: The difference between the temperatures is 85°C. Example 6

TEMPERATURE The temperature in Michigan fell to a low of –10°C in January, while in California the temperature reached a high of 91°C. Find the difference between the temperatures in these two states. A. –101°C B. –81°C C. 81°C D. 101°C Example 6 CYP

Find 4 + (–5). A. –9 B. –1 C. 1 D. 9 Five Minute Check 1

Find –14 – 34. A. 48 B. 20 C. –20 D. –48 Five Minute Check 2

Find –45 – (–8). A. 52 B. 37 C. –37 D. –52 Five Minute Check 3

Evaluate c – b if b = 3 and c = –1. Five Minute Check 4

Evaluate 9 – a if a = –2. A. –11 B. –7 C. 7 D. 11 Five Minute Check 5

What is –4 subtracted from –3? Five Minute Check 6