Hoja De Trabajo De Prealgebra
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. 0Explanation
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.Rate this question:
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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 signoExplanation
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.Rate this question:
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- 3.
-7 + 2 - 5 + (-9 + 1 -3)
- A.
21
- B.
-10
- C.
- 21
- D.
- 10
Correct Answer
C. - 21Explanation
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.Rate this question:
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- 4.
-(2 + 3 - 4 + 7) + ( -5 - 11)
- A.
-20
- B.
- 24
- C.
14
- D.
- 16
Correct Answer
B. - 24Explanation
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.Rate this question:
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- 5.
-12 + 3 - 4 - 7 + 20 -15
- A.
- 7
- B.
- 8
- C.
-11
- D.
17
Correct Answer
C. -11Explanation
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.Rate this question:
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Jul 22, 2024Quiz Edited by
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Nov 07, 2013Quiz Created by
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