What is Checking an Answer?

S0-SA1-0426

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Checking an answer means looking back at your work to see if your solution is correct. It helps you find mistakes and be sure you have the right answer before you submit it.

Simple Example

Quick Example

Imagine you calculated the total cost of 3 samosas, each costing Rs 10. You got Rs 40. To check, you can quickly re-calculate: 3 x Rs 10 = Rs 30. You see your first answer was wrong and correct it to Rs 30.

Worked Example

Step-by-Step

Let's say you need to add 245 + 132.
Step 1: You add the numbers: 245 + 132 = 377.
---Step 2: To check, you can try adding them in a different order, though for addition it's often better to subtract. So, subtract one of the original numbers from your answer. Let's subtract 132 from 377.
---Step 3: 377 - 132 = 245.
---Step 4: Since you got 245, which was the other original number, your addition is correct. If you got a different number, you'd know there was a mistake in your addition.

Why It Matters

Checking answers is super important in every subject, from Maths and Science to English grammar. It helps you get better grades and understand concepts deeply. Future engineers, doctors, and even chefs use checking to make sure their work is perfect.

Common Mistakes

MISTAKE: Not checking at all, or just quickly glancing at the answer. | CORRECTION: Always re-do the calculation or re-read your work carefully, perhaps using a different method if possible.

MISTAKE: Assuming your first answer is always right. | CORRECTION: Approach checking with an open mind, ready to find and correct any errors.

MISTAKE: Checking only when you have extra time, not making it a habit. | CORRECTION: Make checking a regular part of your problem-solving process for every task.

Practice Questions

Try It Yourself

QUESTION: You calculated 7 x 8 = 54. How would you check this using division? | ANSWER: Divide 54 by 8. If the answer is 7, it's correct. (54 / 8 = 6.75, so 54 is wrong. The correct answer is 56).

QUESTION: A bus journey is 150 km. You have already travelled 85 km. You calculated that 75 km are left. Check if this is correct. | ANSWER: Add 85 km (travelled) + 75 km (left) = 160 km. Since the total journey is 150 km, your calculation is incorrect. The correct remaining distance is 150 - 85 = 65 km.

QUESTION: You bought 4 notebooks for Rs 25 each and 2 pens for Rs 10 each. You calculated the total bill as Rs 120. How would you check this? | ANSWER: Cost of notebooks = 4 x 25 = Rs 100. Cost of pens = 2 x 10 = Rs 20. Total cost = 100 + 20 = Rs 120. Your calculation is correct.

MCQ

Quick Quiz

Why is checking your answer important?

It helps you finish quickly

It helps you find mistakes and confirm accuracy

It makes your teacher happy

It shows you are smart

The Correct Answer Is:

Checking your answer helps you catch any errors you might have made and confirms that your solution is accurate. This leads to better understanding and correct results.

Real World Connection

In the Real World

When a cashier at a kirana store calculates your total bill, they often quickly re-add the items or look at the digital display one more time before telling you the amount. This is them checking their answer to make sure they give you the right total, just like you check your exam answers.

Key Vocabulary

Key Terms

ACCURACY: Being correct or precise | VERIFY: To confirm something is true or accurate | RE-CHECK: To check again | SOLUTION: The answer to a problem

What's Next

What to Learn Next

Now that you know how to check answers, you can learn about 'Estimation'. Estimation helps you guess a rough answer before solving, which can also help you check if your final answer is reasonable.