Subtracting Integers #41

Subtracting Integers on a Number Line Move left on a number line to subtract a positive integer. Move right on a number line to subtract a negative integer. Subtracting Integers on a Number Line 2

Example 1: Writing Integer Subtraction Write the subtraction modeled on each number line. A. B. –8 –7 – 6 –5 –4 –3 –2 –1 0 1 The subtraction modeled is –3 – 4 = –7. –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 The subtraction modeled is –5 – (–9) = 4. 3

Write the subtraction modeled on each number line. Example 2 Write the subtraction modeled on each number line. A. B. –8 –7 – 6 –5 –4 –3 –2 –1 0 1 The subtraction modeled is –5 – 2 = –7. –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 The subtraction modeled is –3 – (–5) = 2. 4

Example 3: Subtracting Integers Find the difference. 4 – 6 –3 –2 –1 0 1 2 3 4 5 5

Example 4: Subtracting Integers Find the difference. 3 – (–3) –1 0 1 2 3 4 5 6 7 6

Example 5 Find the difference. 2 – (–5) –1 0 1 2 3 4 5 6 7 7

Example 6 Find the difference. 3 – 6 –3 –2 –1 0 1 2 3 4 5 8

Example 7: Evaluating Integer Expressions Evaluate a – 4 for a = 2. 9

Example 8 Evaluate b – 6 for b= 8. 10