Show:
Adding Rational Numbers
Subtracting Rational Numbers
Multiplying Rational Numbers
Dividing Rational Numbers
True or False!
100
-37 + (-12)
What is (-49)?
100
-18 - 37
What is (-55)?
100
(-12)(-4)
What is 48?
100
-51 divided by 3
What is (-17)?
100

When I am multiplying or dividing fractions, I need a common denominator?

FALSE!

you only need common denominators when add or subtracting!

200
-34.87 + 16.98
What is (-17.89)?
200
-28.39 - (-74.21)
What is 45.82?
200
(12.6)(-3.5)
What is (-44.1)?
200
-25 divided by (-2.5)
What is 10?
200

When you are adding or subtracting decimals, you must line up the decimal point.

TRUE!

When multiplying, you do the calculation like you would with whole numbers and then you adjust the decimal point.

300

11/4+(-5/3)

What is

13/12

or

1 1/12?

?

300
23/3 - 18/4
What is 3 1/6 or 19/6?
300
(3/4)(-7/6)
What is (-7/8)?
300
15/4 divided by (-10/3)
What is (-9/8) or (-1 1/8)?
300

When multiplying or dividing fractions, you should rewrite any mixed numbers as improper fractions.

True!

400
3 1/5 + (-3 3/4)
What is (-11/20)?
400
-742.12 - 89.35
What is -831.47?
400

(-1/3)(3/4)(3/5)

What is (-3/20)?

400
(- 3 1/2) divided by 3/4
What is (-14/3) or (-4 2/3)?
400

When adding or subtracting values and the signs are the same, the answer will be negative.

False!

Subtract the 2 values and the sign will be the sign of the bigger value.

500

-45/4 + (-21/2)

What is -87/4 or -21 3/4?

500

  -6 1/4 - (-12 1/2)

What is 0?

500

(-5/2)(7/6)(-8/3)

What is 70/9 or 7 7/9?

500
(-1/10) divided by (-6/7)
What is 7/60?
500

When multiplying or dividing values with same signs, the value will be positive.

True!

neg * neg = positive

pos * pos = positive