Hoja De Trabajo De Prealgebra

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| By Troy Wesson
T
Troy Wesson
Community Contributor
Quizzes Created: 3 | Total Attempts: 637
Questions: 5 | Attempts: 279

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Hoja De Trabajo De Prealgebra - Quiz

Leyes de los signos y signos de agrupación.


Questions and Answers
  • 1. 

    (-3 - 7 + 8) - (9 - 11)

    • A.

      0

    • B.

      -1

    • C.

      2

    • D.

      - 2

    Correct Answer
    A. 0
    Explanation
    The given expression is (-3 - 7 + 8) - (9 - 11). To solve this, we first simplify the expression within the parentheses: (-3 - 7 + 8) becomes -10 + 8 which is -2. Similarly, (9 - 11) becomes -2. Now we substitute these values back into the original expression: -2 - (-2) becomes -2 + 2 which equals 0. Therefore, the correct answer is 0.

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  • 2. 

    Si antes de un signo de agrupación hay u signo + (mas) entonces lo que está entre los signos de agrupación:

    • A.

      Cambia de signo

    • B.

      Mantiene su signo

    • C.

      Es igual a cero

    • D.

      No se puede sacar de los signos de agrupación

    Correct Answer
    B. Mantiene su signo
    Explanation
    Cuando hay un signo + antes de un signo de agrupación, lo que está entre los signos de agrupación mantiene su signo. Esto significa que si el número dentro de los signos de agrupación es positivo, seguirá siendo positivo después de los signos de agrupación. Por otro lado, si el número dentro de los signos de agrupación es negativo, seguirá siendo negativo después de los signos de agrupación.

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  • 3. 

    -7 + 2 - 5 + (-9 + 1 -3)

    • A.

      21

    • B.

      -10

    • C.

      - 21

    • D.

      - 10

    Correct Answer
    C. - 21
    Explanation
    The given expression involves addition and subtraction of integers. Starting from left to right, we first add -7 and 2 to get -5. Then, we subtract 5 from -5 to get -10. Next, we have a set of parentheses containing three numbers: -9, 1, and -3. Adding these numbers together gives us -11. Finally, we subtract -11 from -10, which is equivalent to adding 11, resulting in -21. Therefore, the correct answer is -21.

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  • 4. 

    -(2 + 3 - 4 + 7) + ( -5 - 11)

    • A.

      -20

    • B.

      - 24

    • C.

      14

    • D.

      - 16

    Correct Answer
    B. - 24
    Explanation
    The given expression is (-2 + 3 - 4 + 7) + (-5 - 11). By simplifying the expression within the parentheses first, we get (-2 - 4 + 7) + (-5 - 11). Further simplifying, we have (1 + 7) + (-16), which gives us 8 - 16. Finally, combining like terms, we get -8. Therefore, the correct answer is -8, not -24.

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  • 5. 

    -12 + 3 - 4 - 7 + 20 -15

    • A.

      - 7

    • B.

      - 8

    • C.

      -11

    • D.

      17

    Correct Answer
    C. -11
    Explanation
    The given expression involves a series of addition and subtraction operations. Starting from left to right, we have -12 + 3 - 4 - 7 + 20 - 15. Adding the positive numbers and subtracting the negative numbers, we get -9 - 11 + 20 - 15. Continuing the calculations, we have -20 + 20 - 15, which simplifies to 0 - 15 and finally gives us the result of -15. Therefore, the correct answer is -15.

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