Subtraction up to 20 — Lesson
🌟 Let's Learn Subtraction up to 20! 🌟
1) Hook - A Fun Story 🍎🍌
Once upon a time in a small Indian village, Meena had 20 juicy mangoes 🍋. She gave 7 mangoes to her friends during the festival. How many mangoes does Meena have now? 🤔
Let's find out by learning subtraction!
2) Core Concepts - What is Subtraction? ➖
Subtraction means taking away some objects from a group. It tells us how many are left.
Example: If Meena has 20 mangoes and gives away 7, we write:
| Total Mangoes | Mangoes Given Away | Mangoes Left |
|---|---|---|
| 20 | 7 | ? |
We do: 20 - 7 = ? Let's count!
Start with 20, take away 7, and count what remains:
- 20 - 1 = 19
- 19 - 1 = 18
- 18 - 1 = 17
- 17 - 1 = 16
- 16 - 1 = 15
- 15 - 1 = 14
- 14 - 1 = 13
So, 20 - 7 = 13. Meena has 13 mangoes left! 🎉
3) Key Formulas / Rules 📝
Subtraction Formula:
A - B = C
Where,
- A = Total number
- B = Number taken away
- C = Number left
4) Did You Know? 🤓
The word "Subtraction" comes from the Latin word "subtrahere", which means "to pull away". Just like when you pull away sweets from a box! 🍬
5) Exam Tips ✔️
- 👉 Always subtract the smaller number from the bigger number.
- 👉 Write the numbers carefully, especially 1 and 7.
- 👉 Count backward on your fingers or a number line to avoid mistakes.
- 👉 Board exams often ask simple subtraction questions like 15 - 8 or 20 - 5.
- 👉 Practice with real things like fruits or toys to understand better.
Keep practicing subtraction and have fun! 🎉👍
Subtraction up to 20 — Mcq
Subtraction up to 20 — Mnemonic
🎉 Fun Mnemonics for Subtraction up to 20 🎉
-
1. The "Chhota-Bada Subtract" Trick 🐘🐁
“Chhota number ko bada number se ghatao,
Answer milta hai, tension mat manao!”
(Subtract the smaller from the bigger,
You’ll get the answer, no need to figure!)Example: 15 - 7 = ?
15 is bada, 7 is chhota, so subtract 7 from 15 = 8 ✅ -
2. The "Sweet Ladoo Subtraction" 🍬
“20 ladoo the, 9 khaye tumne,
Bacha ladoo = 20 - 9, yaad rakhna yeh game!”Imagine you had 20 ladoos, you ate 9, how many are left? 20 - 9 = 11 🎉
-
3. The "Subtraction Dance" 💃🕺
“Step 1: Bade number pe khade ho jao,
Step 2: Chhote number ko peeche chhodo,
Step 3: Jo bacha, woh answer lao!”Like a dance move, stand on the bigger number, step back the smaller, and the leftover is your answer!
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