What is Taking Away Ten?

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Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Taking Away Ten means reducing a number by exactly 10. It's a basic subtraction operation where you find out what's left when ten units are removed from a larger quantity. This helps us understand how numbers change when we decrease them by a fixed amount.

Simple Example

Quick Example

Imagine you have 25 ladoos in a box. If you eat 10 ladoos, how many are left? You are taking away ten from 25. So, 25 - 10 = 15 ladoos are remaining.

Worked Example

Step-by-Step

Let's say your dad gave you Rs. 50 for school expenses. You spent Rs. 10 on a pen. How much money do you have left?

Step 1: Identify the starting amount. You started with Rs. 50.
---Step 2: Identify the amount being taken away. You spent Rs. 10.
---Step 3: Set up the subtraction problem. This is 50 - 10.
---Step 4: Subtract the ones digit: 0 - 0 = 0.
---Step 5: Subtract the tens digit: 5 - 1 = 4.
---Step 6: Combine the results. The answer is 40.

So, you have Rs. 40 left.

Why It Matters

Understanding 'taking away ten' is crucial for building a strong foundation in arithmetic and mental math. It's used by everyone from shopkeepers calculating change to engineers designing structures. This skill helps in careers like accounting, retail management, and even in daily budgeting.

Common Mistakes

MISTAKE: Subtracting only the ones digit or only the tens digit. For example, for 35 - 10, a student might incorrectly say 35 - 0 = 35 or 5 - 0 = 5. | CORRECTION: Remember to subtract both the ones place and the tens place correctly. 35 - 10 means 5 - 0 (ones) and 3 - 1 (tens).

MISTAKE: Confusing 'taking away ten' with 'adding ten'. For example, thinking 20 - 10 is 30. | CORRECTION: Taking away means reducing or making smaller. Adding means increasing or making larger. Always double-check if the operation is subtraction.

MISTAKE: Not aligning numbers correctly when subtracting larger numbers. For instance, writing 120 - 10 but subtracting 10 from 12 instead of 120. | CORRECTION: Always align the numbers by their place value (ones under ones, tens under tens) to ensure correct subtraction.

Practice Questions

Try It Yourself

QUESTION: A bus started with 45 passengers. At the first stop, 10 passengers got off. How many passengers are left on the bus? | ANSWER: 35 passengers

QUESTION: Your mobile data pack has 150 MB left. You watch a short video that uses 10 MB. How much data do you have now? | ANSWER: 140 MB

QUESTION: A farmer had 230 mangoes. He sold 10 mangoes to a customer and then another 10 mangoes to his neighbour. How many mangoes does he have left? | ANSWER: 210 mangoes

MCQ

Quick Quiz

What is 78 - 10?

The Correct Answer Is:

Subtracting 10 from 78 means 8 - 0 in the ones place is 8, and 7 - 1 in the tens place is 6. So, 78 - 10 = 68. Options B, C, and D are incorrect calculations.

Real World Connection

In the Real World

You use 'taking away ten' when you pay for groceries with a Rs. 100 note and the bill is Rs. 90, so the shopkeeper returns Rs. 10. Or when you check your bank balance after making a small Rs. 10 payment using UPI, you'll see your balance reduced by ten rupees.

Key Vocabulary

Key Terms

SUBTRACTION: The process of taking one number or amount away from another | REDUCE: To make something smaller in amount, degree, or size | PLACE VALUE: The value of each digit in a number based on its position | ONES PLACE: The rightmost digit in a whole number, representing units | TENS PLACE: The second digit from the right in a whole number, representing groups of ten

What's Next

What to Learn Next

Now that you understand taking away ten, you can move on to 'Taking Away Any Two-Digit Number'. This will help you subtract larger numbers more easily and improve your mental math skills for everyday calculations.