What is Subtracting from 19?

S0-SA1-1305

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Subtracting from 19 means taking a number away from 19. When you subtract, you find out how much is left or the difference between 19 and another number. It's like having 19 items and giving some away.

Simple Example

Quick Example

Imagine you have 19 ladoos in a box. Your friend eats 5 of them. To find out how many ladoos are left, you would subtract 5 from 19.

Worked Example

Step-by-Step

Let's find out what 19 - 7 is.

Step 1: Start with the total number, which is 19.
---Step 2: Identify the number to be subtracted, which is 7.
---Step 3: You can count backward 7 times from 19: 18, 17, 16, 15, 14, 13, 12.
---Step 4: Alternatively, you can use column subtraction. Write 19 above 7, aligning the ones place.
19
- 7
----
---Step 5: Subtract the ones digits: 9 - 7 = 2.
19
- 7
----
2
---Step 6: The tens digit in 19 is 1, and there is no tens digit in 7 (or it's 0). So, 1 - 0 = 1.
19
- 7
----
12
---Answer: So, 19 - 7 = 12.

Why It Matters

Understanding subtraction from numbers like 19 helps build a strong base for all math. It's crucial for managing money, calculating distances, and even understanding science concepts. Shopkeepers, engineers, and even cricket statisticians use subtraction every day.

Common Mistakes

MISTAKE: Subtracting the larger number from the smaller number by mistake (e.g., thinking 19 - 21 is 2) | CORRECTION: Always subtract the second number from the first number. If the second number is larger, the result will be a negative number, which you will learn later.

MISTAKE: Counting incorrectly when using fingers or mental math, especially when crossing tens (e.g., 19 - 10 = 8 instead of 9) | CORRECTION: Practice counting backwards carefully. Double-check your answer, perhaps by adding the subtracted number back to your result.

MISTAKE: Not aligning numbers correctly in column subtraction (e.g., placing 7 under the 1 in 19) | CORRECTION: Always align the ones place digits and the tens place digits properly before subtracting.

Practice Questions

Try It Yourself

QUESTION: A class has 19 students. 6 students are absent today. How many students are present? | ANSWER: 13 students

QUESTION: You have 19 rupees. You buy a small packet of biscuits for 8 rupees. How much money is left with you? | ANSWER: 11 rupees

QUESTION: A bus started with 19 passengers. At the first stop, 5 passengers got off, and no new passengers got on. How many passengers are now in the bus? | ANSWER: 14 passengers

MCQ

Quick Quiz

What is the result of 19 - 4?

The Correct Answer Is:

To find 19 - 4, you start with 19 and count back 4 steps (18, 17, 16, 15). So, the correct answer is 15.

Real World Connection

In the Real World

When you check your mobile data balance, and it shows 19 GB remaining, then you use 3 GB for watching videos. Your phone app will automatically subtract 3 from 19 to show you the new remaining balance of 16 GB. This is simple subtraction in action!

Key Vocabulary

Key Terms

SUBTRACTION: The process of taking one number away from another | DIFFERENCE: The result of subtracting one number from another | MINUS: A symbol (-) used to show subtraction | REMAINDER: What is left after subtraction

What's Next

What to Learn Next

Once you're comfortable subtracting from 19, you can move on to subtracting from larger numbers like 20, 50, or even 100. This will help you tackle more complex problems and build your mental math skills.