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1-2 Adding and Subtracting Integers

Video Tutor Help Finding absolute valueFinding absolute value (1-2) Adding integers using rulesAdding integers using rules (1-2a and 1-2) Subtracting integersSubtracting integers (1-2a and 1-2) Brain Pop Adding and Subtracting Integers Adding Integers Adding Integers with a Number Line Subtracting Integers Khan Academy Adding integers Subtracting integers

Video Tutor Help Finding absolute value Comparing and ordering integers using absolute value or a number line Adding integers using rules Subtracting integers Subtracting integers to solve problems Adding integers using a number line Multiplying integers Dividing integers to solve problems Writing a fraction as a terminating decimal Writing a fraction as a repeating decimal Ordering fractions and decimals Writing terminating decimals as fractions Ordering rational numbers

Worksheets Daily Notetaking Guide Worksheets Version A Practice, Guided Problem Solving Lesson 1-2 Practice 1-2 Guided Problem Solving 1-2

Vocabulary Practice Vocabulary 1A: Graphic Organizer Vocabulary 1B: Reading Comprehension Vocabulary 1C: Reading/Writing Math Symbols Vocabulary 1D: Visual Vocabulary Practice Vocabulary 1E: Vocabulary C Vocabulary 1F: Vocabulary Review Puzzle Vocabulary (Electronic) Flash Cards

Additional Lesson Examples Step-by-Step Examples Lesson 1-2

Lesson Readiness Lesson Quiz Problem of the Day Lesson 1-2

When addends have the same sign, add. Use their sign with the sum (-5) = -7

When addends have different signs, subtract. Use the sign of the greater addend. 8 + (-9) = -1

Add integers with different signs To add integers with different signs, subtract their absolute values. Give the result the same sign as the integer with the greater absolute value.

Example 2-1a Find. Start at zero. Move three units to the right. From there, move four more units to the right. Answer: 3 4 Add integers on a Number Line

Example 4-1a Find Method 1 Use a number line. Move 8 units to the left. From there, move 4 units left. Start at zero. Add Integers with the Same Sign

Example 4-1a Method 2 Use counters. Answer: So,

Example 4-2a Add and Find Both numbers are negative, so the sum in negative. Answer: –26 Add Integers with the Same Sign

Example 4-3a Method 2 Use counters. Answer: So,

Example 4-4a Find Method 1 Use a number line. Move 5 units left. From there, move 9 units right. Start at zero. Add Integers with Different Signs

Example 4-4a Method 2 Use counters. Answer: So,

Example 4-5a To find subtract from Find The sum is positive because > Answer: 17 Add Integers with Different Signs

Find. Example 2-2a Answer: –9 Add and. Both numbers are negative, so the sum is negative. Add Integers with the Same Sign

Find. Example 2-4a Answer: 1 To find –9 + 10, subtractfrom. The sum is positive because Add Integers with Different Signs

Example 2-4b Answer: –7 Find. To find 8 + (–15), subtract from The sum is negative because Add Integers with Different Signs

Start at 0. Move 1 unit right. Start at 0. Move 3 units left. Use a number line to find each sum. Adding and Subtracting Integers LESSON 1-2 a. (–3) + 1 b. 1 + (–3) The sum is –2. Then move 1 unit right. Then move 3 units left. Additional Examples

Find each sum. Adding and Subtracting Integers LESSON 1-2 a (–6) b. –12 + (–19) 24 + (–6) = 18 Since 24 has a greater absolute value, the sum is positive. |24| – |–6|Find the difference of the absolute values. Since both integers are negative, the sum is negative. –12 + (–19) = –31 Additional Examples

Find. Example 2-3a Start at zero. Move 7 units to the right. From there, move 11 units to the left. Answer: 7 –11 Add Integers on a Number Line

Find. Example 2-3b Start at zero. Move 2 units to the left. From there, move 9 units to the right. Answer: –2 9 Add Integers on a Number Line

Example 4-3a Find Method 1 Use a number line. Move 4 units right. From there, move 6 units left. Start at zero. Add Integers with Different Signs

To subtract an integer, add its opposite. 3 – 6 4 – (-9) becomes 3 + (-6) = -3 becomes = 13

Example 3-1a Simplify. Answer: –5 Find. To subtract 14, add –14. Subtract a Positive Integer

Example 3-1b Answer: –18 Simplify. Find. To subtract 8, add –8. Subtract a Positive Integer

Find. Example 3-2a Answer: 19 Simplify. To subtract –4, add 4. Subtract a Negative Integer

Find. Example 3-2b Answer: –3 Simplify. To subtract –7, add 7. Subtract a Negative Integer

Example 5-1a Find To subtract 6, add Add. Answer: –4 Subtract a Positive Integer

Example 5-2a Find Add. Answer: –12 To subtract 5, add Subtract a Positive Integer

Example 5-3a Find Add. Answer: 19 To subtract –8, add 8. Subtract a Negative Integer

Example 5-4a Find Add. Answer: 3 To subtract –9, add 9. Subtract a Negative Integer

Find each difference. Adding and Subtracting Integers LESSON 1-2 b. –7 – 2 a. 5 – (–3) 5 – (–3) = 5 + (3)Add the opposite of –3, which is 3. = 8Simplify. –7 – 2 = –7 + (–2)Add the opposite of 2, which is –2. = –9Simplify. Additional Examples

Find each difference. Adding and Subtracting Integers LESSON 1-2 b. –1 – 5 = a. –3 – (–8) = = –6 = 5 Simplify. –1 – 5 = –1 + (–5) –3 – (–8) = –3 + 8 Add the opposite. Additional Examples

Recorded temperatures at Amundsen-Scott Station in Antarctica have ranged from a low of – 89°F to a high of –13°F. Find the difference. Adding and Subtracting Integers LESSON 1-2 Subtract the low temperature from the high temperature. The temperature range at Amundsen-Scott Station is 76°F. –13 – (–89) = – Add the opposite of –89, which is 89. = 76Simplify. Additional Examples