1.
What is -5 plus 3?
Correct Answer
A. -2
Explanation
The correct answer is -2. In the operation of adding -5 and 3, you are essentially dealing with the combination of negative and positive integers. On a number line, starting from zero, you would move 5 units to the left to represent -5, then 3 units to the right to add 3. This process ends 2 units left of zero, resulting in a sum of -2. This demonstrates how addition with integers can be visualized on a number line, showing the movement towards zero from a negative starting point, and then partially offsetting this movement with positive progression.
2.
7-(9-4) = ____________
Correct Answer
B. 2
Explanation
To solve this, we need to follow the order of operations (PEMDAS/BODMAS):
Parentheses: 9 - 4 = 5
Subtraction: 7 - 5 = 2
Therefore, 7 - (9 - 4) = 2
3.
What is the product of -6 and 5?
Correct Answer
A. -30
Explanation
The correct answer is -30. The multiplication of -6 by 5, involving a negative and a positive integer, adheres to the rule that the product of differing signs is negative. The multiplication of the absolute values (6 and 5) results in 30, and applying the sign rule, it becomes -30. This problem exemplifies the principle that while multiplication magnifies values, the sign of the result is determined by the rules governing the signs of the factors involved.
4.
What results from dividing -20 by 5?
Correct Answer
A. -4
Explanation
The correct answer is -4. Dividing -20 by 5 requires determining how many times the divisor (5) fits into the dividend (-20). Since 5 fits into 20 exactly four times, and considering the sign rule for division (a negative divided by a positive yields a negative result), the quotient here is -4. This division example reinforces understanding that the division of integers follows the same absolute value rules as positive numbers, but with additional attention to the signs involved.
5.
3-(-8)
Correct Answer
B. 11
Explanation
When subtracting a negative number, we change the operation to addition and change the sign of the second number. So, 3 - (-8) becomes 3 + 8. This is because subtracting a negative value is equivalent to adding its positive counterpart. Visualize a number line: start at 3 and move 8 units to the right (in the positive direction) to arrive at the answer, 11.
6.
How much is -3 times -7?
Correct Answer
A. 21
Explanation
The correct answer is 21. Multiplying -3 by -7 includes two negative numbers. According to the rules of multiplication, when two negative integers are multiplied, their signs cancel each other out, resulting in a positive product. Thus, -3 times -7 equals 21. This scenario is useful for illustrating how the multiplication of negatives, unlike addition, leads to a positive outcome due to the inherent rules of arithmetic regarding negative numbers.
7.
What is the sum of -10 and -5?
Correct Answer
A. -15
Explanation
The correct answer is -15. In the operation where -10 and -5 are added, both numbers being negative means their individual distances from zero on a number line are combined further into the negative direction. The total distance from zero is the sum of these distances, which results in -15. This problem provides a clear example of how adding two negative integers increases the magnitude of the resultant number in the negative direction.
8.
What results from -30 divided by -10?
Correct Answer
B. 3
Explanation
The correct answer is 3. When dividing -30 by -10, both the dividend and the divisor are negative. The rule that the division of two negative numbers results in a positive quotient applies here, hence -30 divided by -10 yields a positive 3. This division demonstrates that negatives cancel out, producing a positive result, and emphasizing the consistent logic within arithmetic operations involving negative numbers.
9.
How much is 4 minus -12?
Correct Answer
A. 16
Explanation
The correct answer is 16. For the expression 4 minus -12, subtracting a negative is equivalent to adding its positive equivalent. Therefore, it transforms into 4 + 12, resulting in 16. This calculation teaches the concept that subtraction of a negative leads directly to addition, a key concept in handling integer operations effectively.
10.
What is the product of -1 and -1?
Correct Answer
A. 1
Explanation
The correct answer is 1. The product of -1 times -1 involves multiplying two negative integers. According to integer multiplication rules, the negatives cancel out, making the result positive. Therefore, -1 multiplied by -1 equals 1. This is a straightforward example of how multiplication rules apply to negative numbers, emphasizing the unique property that multiplying two negative numbers yields a positive result.