Signed Numbers Test Review

Signed Numbers Test Review

Mrs. Salamone

​Test Review

1. ​Complete the activities on each slide to preview the unit test.​

2. Keep notes in your math spiral and organize to use during your unit test this week.

​Fractions to decimals

Multiple Choice

The fraction  $$\frac{4}{15}$$  can be expressed as which decimal?

• $$0.26$$  

• $$0.2\overline{6}$$  

• $$0.\overline{26}$$  

• 4.15

Multiple Choice

The fraction $$\frac{1}{9}$$   can be expressed as which decimal?

• 1.9

• $$0.1$$  

• $$0.\overline{1}$$  

​Rules for positive answers....

​Adding:

​

​Two positives add to give a positive answer.

​

​A positive and a negative give you a positive answer if the positive number has a higher absolute value.

​

​Examples:

​7 + (-3) = +4 but -7 + 3 = -4

​Multiplying or Dividing:

​

​Multiply or Divide two positives or two negatives.

​

​Examples:

​

​(4)(3) = +12 (-4)(-3) = +12

Multiple Choice

Which sum below would have a positive value?

• -13 + 6

• 6 + (-13)

• -6 + (-12)

• -6 + 12

Multiple Choice

Which calculation results in a positive result?

• -6(4)

• -21(-2)

• -75 $$\div$$  5

• 14 $$\div$$  -7

​Subtraction is the same as Adding the Opposite.

​Change subtraction to addition of the opposite:

​Keep Change Change

​-9 - (-3)

-9 + 3

​= -6

​Watch the following video on Subtracting signed numbers.

Multiple Choice

Which sum is equivalent to the difference 4 - 12

• -4+12

• -4+(-12)

• 4 + (-12)

• 4 + 12

Multiple Choice

Which sum is equivalent to the difference 20 - (-14)

• 20 + 14

• -20 + (-14)

• -20 + 14

• 20 + (-14)

Multiple Choice

Which sum is equivalent to the difference 7 - 15?

• -(7+15)

• -15+7

• -7+15

• 15+-7

Use your scientific calculator.

​Watch the following video:

Multiple Choice

What is the value of the expression below?

$$3\ -\ 5\ -\ \left(-9\right)\ +\ \left(-12\right)$$  

• -5

• -9

• 5

• 29

Multiple Choice

Which is the value of the following expression shown below?

$$6\left(-7\ +\ 4\right)\ +\ \left(-4\right)^2$$  

• 2

• 50

• -2

• -4

Multiple Choice

JoJo evaluated the expression

$$-12(-3)-\frac{10}{5}$$   by doing the following;

What did JoJo do incorrectly?

• Subtracted before multiplying.

• Dividing before subtracting.

• Multiplied wrong.

• Subtracted wrong.

​Number Lines

​Watch the following video:

Multiple Choice

The diagram represents which of the following calculations?

• -2 + 1 = 3

• -2 + 3 = 1

• 2 - 3 = -1

• 2 - 3 = -1

​Real World Problems

with Signed Numbers

​Watch the following video

Multiple Choice

Which situation could be solve using the equation -8 + 8 = 0?

• Todd has $8 in his account and deposits $8 into his account.

• Janice recorded the temperature yesterday as $$-8\degree F$$  . The temperature increased $$8\degree F$$  .

• Grace spent $8 on music, then spent $8 more on snacks.

• Melvin skated 8 blocks to the post office, stopped to mail a letter and then skated the remaining 8 blocks to the store.

​Distance....

​To find the distance between two points:

1. ​Subtract​

2. Take the absolute value of your answer

​

​

​Watch the following video:

Multiple Choice

What is the distance between -1 and 10?

• 2

• 11

• -11

• 17

Multiple Choice

What is the distance between -4 and -5

• 9

• -9

• 1

• -1

​Unit Test this week

​

​1. Study your yellow packet

​2. Review this Quizizz until you understand all the questions.

​3. Complete all HW and Classwork assignments BEFORE Test day.