(Ultimate Guide) Cisco 500-445 Exam Real Questions

Study Notes

Basic Subtraction

Subtraction is the arithmetic operation that represents the difference between two numbers.
It is the inverse operation of addition.
The minuend is the number from which another number (the subtrahend) is subtracted.
The subtrahend is the number that is subtracted from the minuend.
The difference is the result of the subtraction operation.
Example: 10 - 5 = 5 (10 is the minuend, 5 is the subtrahend, and 5 is the difference.)

Properties of Subtraction

Subtraction is not commutative: a - b ≠ b - a
Subtraction is not associative: (a - b) - c ≠ a - (b - c).
Subtraction has no identity element.
Subtraction is unique: There is only one difference for a given pair of numbers.
Subtraction is related to addition. Subtracting a number is the same as adding its opposite. (e.g., 5 - 3 = 2 and 5 + (-3) = 2).

Mental Math Techniques

Breaking down numbers: Breaking down a larger number into easier to subtract smaller parts, then adding the results. This is useful for subtracting numbers of more than one digit.
Using complements: Finding the difference between a number and the next ten, hundred, etc. and then adjusting that difference through other operations.
Adding to make a difference equal to the required difference. Use addition or subtraction to adjust or alter the given number.
Front-end subtraction: Focus on the largest place values first, then adjust as needed to determine an approximate difference.
Rounding: Estimating subtractions by rounding numbers or values to simpler, smaller values.

Word Problems

Word problems present subtraction situations in real-world scenarios.
To solve a word problem:
Read the problem carefully and identify the key information.
Determine what the question is asking.
Choose the appropriate operation—subtraction or other method.
Solve the problem using correct steps.
Check the answers to ensure they make sense in the context of the problem.
Examples:
"John had 15 apples. He gave away 7 apples. How many apples does John have left?"
"A store had 200 shirts. 125 were sold. How many shirts are left in the store?"
"Mary read 30 pages of a book. If the book has 100 pages in total, how many more pages does she need to read?"

Number Line

A number line is a visual representation of numbers.
It helps to visualize subtraction as moving along the number line from one number to another.
To subtract using a number line:
Start at the minuend on the number line.
Move to the left by the amount of the subtrahend.
The final position on the number line is the difference.

500 - 445

To solve the subtraction problem 500 - 445:
Line up the numbers vertically, aligning place values (hundreds, tens, ones).
Subtract the ones column (0 - 5): Borrow from the tens column. 10 - 5 = 5
Subtract the tens column (9 - 4 = 5)
Subtract the hundreds column (4 - 4 = 0).
The answer is 55.

Description

Explore the fundamentals of subtraction in this quiz. Learn about the components of subtraction, its properties, and effective mental math techniques. Test your understanding of how subtraction differs from addition.

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