What is Ten Less?

S0-SA1-0082

Grade Level:

Class 1

Maths

Definition

What is it?

To find 'Ten Less' than a number means to subtract 10 from that number. It helps us find a number that is smaller by exactly ten units.

Simple Example

Quick Example

Imagine you have 35 laddoos. If you eat 10 laddoos, you will have 'Ten Less' than what you started with. So, 35 - 10 = 25 laddoos left.

Worked Example

Step-by-Step

Let's find 'Ten Less' than 57.

Step 1: Understand the question. 'Ten Less' means we need to subtract 10 from the given number.
---Step 2: Identify the given number, which is 57.
---Step 3: Set up the subtraction problem: 57 - 10.
---Step 4: Subtract the ones place: 7 - 0 = 7.
---Step 5: Subtract the tens place: 5 - 1 = 4.
---Step 6: Combine the results from the ones and tens place.
---Answer: 'Ten Less' than 57 is 47.

Why It Matters

Understanding 'Ten Less' is a basic step in learning subtraction and number sense. It's crucial for everyday calculations, from managing your pocket money to understanding discounts in shops. Even engineers and scientists use subtraction constantly in their work.

Common Mistakes

MISTAKE: Adding 10 instead of subtracting. For example, for 'Ten Less than 40', writing 40 + 10 = 50. | CORRECTION: 'Less' always means subtraction. Remember, you are finding a smaller number.

MISTAKE: Confusing 'Ten Less' with 'One Less'. For example, for 'Ten Less than 25', writing 25 - 1 = 24. | CORRECTION: Pay close attention to the word 'Ten'. It means you must subtract 10, not 1.

MISTAKE: Making errors in basic subtraction. For example, calculating 63 - 10 as 52. | CORRECTION: Practice your basic subtraction facts, especially with numbers ending in zero (like 10). Double-check your calculation for both ones and tens places.

Practice Questions

Try It Yourself

QUESTION: What is Ten Less than 80? | ANSWER: 70

QUESTION: Your favourite cricket player scored 125 runs in the first match. In the second match, he scored Ten Less runs. How many runs did he score in the second match? | ANSWER: 115 runs

QUESTION: A shop had 98 packets of biscuits. They sold Ten Less packets on Monday and then sold 5 more packets on Tuesday. How many packets did they sell on Monday? | ANSWER: 88 packets

MCQ

Quick Quiz

Which of these shows 'Ten Less' than 42?

42 + 10

42 - 1

42 - 10

42 + 1

The Correct Answer Is:

Option C, 42 - 10, correctly represents 'Ten Less' than 42 because 'less' means to subtract, and we are subtracting 10. The other options involve addition or subtracting 1.

Real World Connection

In the Real World

When you check your mobile data balance and see you have 25 GB left, but then use 10 GB for streaming a movie, you have 'Ten Less' data. Your remaining balance would be 15 GB. This is a common calculation you do without even thinking!

Key Vocabulary

Key Terms

LESS: Smaller in amount or quantity | SUBTRACT: To take away a number from another number | NUMBER SENSE: An intuitive understanding of numbers and their relationships | DIGIT: A single symbol used to make numerals (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

What's Next

What to Learn Next

Great job understanding 'Ten Less'! Next, you can explore 'Ten More' to learn about increasing numbers by ten. After that, you'll be ready for 'One Hundred Less' and more complex subtraction problems.