Subtracting Rational Numbers

Subtracting Rational Numbers

Lesson 1-5

Subtracting Rational Numbers

• To subtract rational numbers, follow the same rules as subtracting integers.

• KCO

• Keep, Change, Opposite

Subtracting Rational Numbers

Subtracting Rational Numbers

Find 12.8 – 21.6

12.8 + (-21.6)

21.6 – 12.8

-8.8

Multiple Choice

$$\frac{1}{3}-\left(-\frac{1}{3}\right)$$  

• $$\frac{1}{3}$$  

• $$-\frac{2}{3}$$  
  

• $$0$$  
  

• $$\frac{2}{3}$$  
  

Multiple Choice

$$-3\frac{1}{3}-\frac{5}{6}$$  

• $$-4\frac{1}{6}$$  

• $$-2\frac{1}{2}$$  
  

• $$4\frac{1}{6}$$  

• $$2\frac{1}{2}$$  

Multiple Choice

$$4\frac{1}{2}-5\frac{1}{4}$$  

• $$\frac{3}{4}$$  
  

• $$9\frac{3}{4}$$  

• $$-\frac{3}{4}$$  

• $$-9\frac{3}{4}$$  
  

Multiple Choice

-8.4 - 6.7

• 1.3

• -15.1

• 15.3

• -1.3

Multiple Choice

-20.5 - (-20.5)

• 1

• -41

• 41

• 0

Multiple Choice

0.41 - (-0.07)

• 0.48

• -0.48

• 0.34

• -0.34

Finding Distance

Finding Distance

Finding Distance

•In the water, the bottom of a boat is 2.1 feet below the surface, and the top of the boat is 8.7 feet above it. Towed on a trailer, the bottom of the boat is 1.3 feet above the ground. Can the boat and the trailer pass under the bridge?

•Find the height of the boat.

•8.7- (-2.1) = 8.7 + 2.1 = 10.8

•Find the height of the boat and the trailer.

•10.8 + 1.3 = 12.1

•12.1 is greater than 11 ft 8 in, so the trailer and the boat cannot pass.

Multiple Choice

Find the distance between -7.5 and -15.3 on a number line.

• 22.8

• 7.8

• -22.78

• -7.8