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Prealgebra

Operations with Integers

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1
Positive and Negative Numbers

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2
Addition with Integers

**Mini Lecture**

Add.

\(2+3\)

\(-2+3\)

\(2+(-3)\)

\(-2+(-3)\)

\(7+8\)

\(-6+(-5)\)

\(-10+3\)

\(4+(-12)\)

\(-2+4+(-6)\)

\(-201+(-143)+(-101)\)

\((-8+5)+(-6+2)\)

\(20+(-30+50)+10\)

What number do add to \(8\) to get \(3\)?

What number do you add to \(-3\) to get \(-7\)?

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3
Subtraction with Integers

Planes used by the United States during World War II were not pressurized or sealed from outside air. As a result, the temperature inside was the same as the surrounding air temperature outside. Suppose the temperature inside a B-17 Flyinf Fortress is \(50^\circ\)F at takeoff and then drops to \(-30^\circ\)F when the plane reaches its cruising altitude of \(28,000\) feet. Find the difference in temperature inside the plane.

**Mini Lecture**

Subtract.

\(8-6\)

\(-4-1\)

\(3-(-9)\)

\(-10-(-3)\)

Simplify.

\(-8+3-4\)

\(-7-3-6\)

Subtract \(-3\) and \(8\)

Subtract \(-6\) and \(5\)

Find the difference of \(-7\) and \(-3\)

What number do you subtract from \(5\) to get \(8\)?

Felicia has a balance of \(\$68\) in her checking account when she writes a check for \(\$37\) and then another check for \(\$53\). Write a subtraction problem that gives her new balance in her checking account.