Page 26 - Math Course 1 (Book 1)

Adding Integers

Find each sum.

10.) 25 + 18 + ( -23 ) 11.) -5 + 4 + (-27) 12.) -65 + (-2) + 9

TEMPERATURE DIVING
At 4:00 A.M., the outside temperature was 28°F. By Submarine descended 32 feet below the surface.
4:00 P.M. it rose 38 degrees. What was the It rose 13 feet to look at a coral reef. Write an
temperature at 4:00 P.M.? addition sentence to f nd its current depth.

Answer Answer

Subtracting Integers
Mo. 1

Lesson 4

KEY CONCEPTS:
1. Subtract Positive and Negative Integers.
2. Evaluate Expressions Containing Variables.

MO. 1 - L4a

Subtracting Positive and -4 - 6 = -4 + (-6) = -2
Negative Integers 4 - (-6) = 4 + (6) = 10

Key Concept

Subtracting Integers

Words: To subtract an integer, add its additive
Inverse.

Symbols: a - b = a + ( -b )

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