Find the square root of 169

Oct 13, 2025 by pinkandtrash.com 59 views

In today's digital age, it's easy to rely on calculators for even the simplest math problems. However, developing mental math skills can be incredibly beneficial for everyday life, from balancing a checkbook to calculating tips at a restaurant. In this article, we'll explore five math problems that require no calculator, and we'll break down each step to help you understand the process.

Problem 1.1: Subtracting and Adding Integers

The Problem

$18 - 10 + 4 - 6$

Step-by-Step Solution

To solve this problem, we'll follow the order of operations (PEMDAS):

Subtract 10 from 18: $18 - 10 = 8$
Add 4 to 8: $8 + 4 = 12$
Subtract 6 from 12: $12 - 6 = 6$

Therefore, the final answer is 6.

Problem 1.2: Subtracting Negative Numbers

The Problem

$-24 - (-18)$

Step-by-Step Solution

When subtracting a negative number, we can simply change the subtraction sign to an addition sign and change the negative sign to a positive sign:

$-24 - (-18) = -24 + 18$

Add 18 to -24: $-24 + 18 = -6$

Therefore, the final answer is -6.

Problem 1.3: Multiplying and Dividing Integers

The Problem

$8 \times (-3) \div (-6)$

Step-by-Step Solution

To solve this problem, we'll follow the order of operations (PEMDAS):

Multiply 8 and -3: $8 \times (-3) = -24$
Divide -24 by -6: $-24 \div (-6) = 4$

Therefore, the final answer is 4.

Problem 1.4: Exponents and Negatives

The Problem

$-4^2 + (-4)^3$

Step-by-Step Solution

To solve this problem, we'll evaluate the exponents first:

Calculate -4^2: $(-4)^2 = 16$
Calculate (-4)^3: $(-4)^3 = -64$
Add 16 and -64: $16 + (-64) = -48$

Therefore, the final answer is -48.

Problem 1.5: Square Root

The Problem

$\sqrt{169}$

Step-by-Step Solution

To solve this problem, we'll find the square root of 169:

Find the square root of 169: $\sqrt{169} = 13$

Therefore, the final answer is 13.

Conclusion

In our previous article, we explored five math problems that require no calculator, and we broke down each step to help you understand the process. Now, let's answer some frequently asked questions about mental math and calculations.

Q: What is mental math?

A: Mental math is the ability to perform mathematical calculations in your head without the use of a calculator or other external aid. It involves using mental arithmetic to solve problems, often using simple calculations and estimation techniques.

Q: Why is mental math important?

A: Mental math is important for several reasons:

Improved math skills: Practicing mental math helps to develop your math skills and build confidence in your ability to solve problems.
Increased speed: Mental math can help you solve problems faster than using a calculator, which can be beneficial in situations where time is limited.
Better estimation: Mental math can help you make better estimates and approximations, which can be useful in everyday life.
Enhanced problem-solving skills: Mental math requires you to think critically and creatively, which can help you develop problem-solving skills that can be applied to other areas of life.

Q: How can I improve my mental math skills?

A: Here are some tips to help you improve your mental math skills:

Practice regularly: Make mental math a part of your daily routine by practicing simple calculations and estimation techniques.
Use real-life examples: Use everyday situations to practice mental math, such as calculating tips or change.
Focus on basic arithmetic: Master basic arithmetic operations such as addition, subtraction, multiplication, and division.
Use mental math tricks: Learn mental math tricks and shortcuts to help you solve problems more efficiently.
Play mental math games: Engage in mental math games and puzzles to make learning more fun and engaging.

Q: What are some common mental math tricks?

A: Here are some common mental math tricks:

Doubling and halving: To quickly calculate the double or half of a number, simply multiply or divide by 2.
Multiplying by 5: To quickly calculate the product of a number and 5, simply multiply the number by 10 and then divide by 2.
Multiplying by 10: To quickly calculate the product of a number and 10, simply add a zero to the end of the number.
Estimating percentages: To quickly estimate a percentage, simply divide the percentage by 100 and then multiply by the number.

Q: Can mental math be used in real-life situations?

A: Yes, mental math can be used in a variety of real-life situations, such as:

Calculating tips: To quickly calculate a tip, simply multiply the total bill by 15% or 20%.
Balancing a checkbook: To quickly balance a checkbook, simply add up the deposits and subtract the withdrawals.
Calculating change: To quickly calculate change, simply subtract the amount paid from the total bill.
Estimating costs: To quickly estimate costs, simply multiply the number of items by the cost per item.

Conclusion

Mental math is an essential skill that can be used in a variety of real-life situations. By practicing mental math regularly and using mental math tricks and shortcuts, you can improve your math skills and become more confident in your ability to solve problems. Remember, mental math is not just about solving math problems, it's about developing problem-solving skills that can be applied to other areas of life.