Basic Definitions: Omitting parentheses

Examples with solutions for Basic Definitions: Omitting parentheses

Exercise #1

(+71)+(18)= (+71)+(-18)=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Calculate the absolute values of the numbers: +71=71 |+71| = 71 and 18=18 |-18| = 18 .
  • Subtract the smaller absolute value from the larger one: 7118=53 71 - 18 = 53 .
  • Determine the sign of the result by using the sign of the number with the larger absolute value. Here, 71 71 is larger and positive, so the result is positive.

Now, let's go through the calculations:
Step 1: Calculate the absolute difference 7118=53 71 - 18 = 53 .
Step 2: The number with the larger absolute value is 71 71 , which is positive. Thus, the result is also positive.

Therefore, the solution to the problem is 53 53 .

Answer

53 53

Exercise #2

(+43)(+15)= (+43)-(+15)=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given numbers.
  • Step 2: Apply the subtraction operation.
  • Step 3: Calculate the result.

Now, let's work through each step:
Step 1: The given numbers are +43 +43 and +15 +15 .
Step 2: We need to subtract +15 +15 from +43 +43 .
Step 3: Performing this calculation gives us 4315=28 43 - 15 = 28 .

Therefore, the solution to the problem is 28 28 .

Answer

28 28

Exercise #3

(+186)(14)= (+\frac{18}{6})-(-\frac{1}{4})=

Video Solution

Step-by-Step Solution

To solve this problem, we will follow these steps:

  • Simplify the given expression (+186)(+\frac{18}{6}).
  • Recognize that subtracting a negative fraction, ((14))(-(-\frac{1}{4})), is equivalent to adding its positive counterpart.
  • Perform the addition to find the final result.

Now, let's work through each step:

Step 1: Simplify the expression 186\frac{18}{6}.

Divide 18 by 6:

186=3\frac{18}{6} = 3

Step 2: Recognize the operation with the negative fraction:

Subtracting a negative is equivalent to adding a positive:

(3(14))=3+14(3 - (-\frac{1}{4})) = 3 + \frac{1}{4}

Step 3: Perform the addition:

Convert 3 to a fraction with a common denominator of 4:

3=1243 = \frac{12}{4}

Add the fractions:

124+14=134\frac{12}{4} + \frac{1}{4} = \frac{13}{4}

Step 4: Convert the fraction 134\frac{13}{4} to a decimal:

134=3.25\frac{13}{4} = 3.25

Therefore, the solution to the problem is 3.25\mathbf{3.25}.

Answer

3.25 3.25

Exercise #4

(24)(+3.5)= (-\frac{2}{4})-(+3.5)=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Simplify the fraction 24-\frac{2}{4}.
  • Perform the subtraction with the positive number.

Step 1: Simplify 24-\frac{2}{4}.
- The fraction 24-\frac{2}{4} simplifies to 12-\frac{1}{2} because both the numerator and the denominator can be divided by 2.

Step 2: Perform the subtraction.
- Now, calculate 123.5-\frac{1}{2} - 3.5.

To subtract the numbers, transform 12-\frac{1}{2} into a decimal: 0.5-0.5.

Thus, the expression becomes:

0.53.5=4.0-0.5 - 3.5 = -4.0.

Therefore, the solution to the problem is 4 -4 .

Answer

4 -4

Exercise #5

(22)(334)= (-2^2)-(-3\frac{3}{4})=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify (22)(-2^2).
  • Step 2: Convert 334-3\frac{3}{4} to an improper fraction.
  • Step 3: Subtract the results from Step 1 and Step 2.

Now, let's work through each step:
Step 1: 22-2^2 means square the 2 first and then apply the negative: 22=(22)=4-2^2 = -(2^2) = -4.

Step 2: Convert 334-3\frac{3}{4} into an improper fraction:
A mixed fraction 334-3\frac{3}{4} can be represented as (3+34)=(124+34)=154-\left(3 + \frac{3}{4}\right) = -\left(\frac{12}{4} + \frac{3}{4}\right) = -\frac{15}{4}.

Step 3: Subtract the results:
Subtract (154)-(-\frac{15}{4}) from 4-4:
This is equivalent to 4+154-4 + \frac{15}{4}. To add these, convert 4-4 to a fraction with the same denominator: 4=164-4 = -\frac{16}{4}.
Now, 164+154=16154=14-\frac{16}{4} + \frac{15}{4} = -\frac{16 - 15}{4} = -\frac{1}{4}.

Therefore, the solution to the problem is 14-\frac{1}{4}.

Answer

14 -\frac{1}{4}

Exercise #6

(+0.5)+(+12)= (+0.5)+(+\frac{1}{2})=

Video Solution

Step-by-Step Solution

The given mathematical expression is (+0.5)+(+12)(+0.5) + (+\frac{1}{2}). Let us solve this step by step:

  • Step 1: Recognize equivalency: 12\frac{1}{2} in decimal form is 0.50.5.
  • Step 2: Rewriting the expression: (+0.5)+(+0.5)(+0.5) + (+0.5).
  • Step 3: Direct addition: 0.5+0.5=10.5 + 0.5 = 1.

Both terms are positive, and hence they add directly without altering each other's sign, resulting in a total of 11. Therefore, the solution is 11.

Answer

1 1

Exercise #7

(+2.16)+(4116)= (+2.16)+(-4\frac{1}{16})=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert the mixed number
  • Step 2: Add the numbers
  • Step 3: Determine the sign and calculate the result

Now, let's work through each step:

Step 1: Convert 4116 -4\frac{1}{16} to a decimal.
The fraction 116\frac{1}{16} is equivalent to 0.0625 0.0625 as a decimal. Therefore, the mixed number 4116 -4\frac{1}{16} converts to 4.0625 -4.0625 .

Step 2: Add +2.16 +2.16 to 4.0625 -4.0625 .
The expression becomes 2.16+(4.0625) 2.16 + (-4.0625) , which is equivalent to 2.164.0625 2.16 - 4.0625 .

Step 3: Perform the subtraction operation.
Subtract 4.0625 4.0625 from 2.16 2.16 :

2.164.0625=1.90625 2.16 - 4.0625 = -1.90625

Therefore, the solution to the problem is 1.90625 -1.90625 .

Answer

1.90625 -1.90625

Exercise #8

(326)+(2.75)= (-3\frac{2}{6})+(-2.75)=

Video Solution

Step-by-Step Solution

To solve this problem, we'll convert both numbers to fractions and then perform the addition:

Step 1: Convert 326-3\frac{2}{6} to an improper fraction.
First, simplify 26\frac{2}{6} to 13\frac{1}{3}:
326=313=(3×3+13)=103-3\frac{2}{6} = -3\frac{1}{3} = -\left(\frac{3 \times 3 + 1}{3}\right) = -\frac{10}{3}.

Step 2: Convert 2.75-2.75 to a fraction.
2.75=275100-2.75 = -2\frac{75}{100}. Simplify 75100\frac{75}{100} to 34\frac{3}{4}:
234=(2×4+34)=114-2\frac{3}{4} = -\left(\frac{2 \times 4 + 3}{4}\right) = -\frac{11}{4}.

Step 3: Find a common denominator and add the fractions.
The common denominator for 3 and 4 is 12.
Convert 103-\frac{10}{3} to 4012-\frac{40}{12} and 114-\frac{11}{4} to 3312-\frac{33}{12}.

Step 4: Add the fractions:
4012+3312=7312-\frac{40}{12} + -\frac{33}{12} = -\frac{73}{12}.

Step 5: Convert 7312-\frac{73}{12} back to a mixed number.
7312=6112-\frac{73}{12} = -6\frac{1}{12}.

Therefore, the solution to the problem is 6112-6\frac{1}{12}.

Answer

6112 -6\frac{1}{12}