Multiplication (2-digit) — Lesson
🌟 Let's Multiply 2-Digit Numbers! 🌟
1) Hook: A Fun Story 🍎🍌
Raju went to the market to buy fruits for his family. He bought 23 apples and 12 bananas. Each apple costs ₹5 and each banana costs ₹3. Can you help Raju find out how much money he spent on apples and bananas?
To find out, we need to multiply 23 × 5 and 12 × 3. Let's learn how to multiply 2-digit numbers like 23 and 12!
2) Core Concepts: How to Multiply 2-Digit Numbers ✏️
Let's multiply 23 × 12 step by step.
| 2 (Tens) | 3 (Ones) | |
| 1 (Ones) | 2 × 1 = 2 | 3 × 1 = 3 |
| 1 (Tens) | 2 × 10 = 20 | 3 × 10 = 30 |
Step 1: Multiply 23 by 2 (ones place of 12):
23 × 2 = 46
Step 2: Multiply 23 by 1 (tens place of 12, which is 10):
23 × 10 = 230
Step 3: Add both results:
230 + 46 = 276
So, 23 × 12 = 276.
3) Key Formulas / Rules 📚
AB × CD = (AB × D) + (AB × C × 10)
4) Did You Know? 🤔
Multiplication is like adding the same number many times! For example, 23 × 12 means you add 23 twelve times:
23 + 23 + 23 + ... (12 times) = 276
But multiplication helps us find the answer quickly without adding again and again!
5) Exam Tips ✔️
- Always multiply the ones place digit first.
- Remember to add a zero (0) when multiplying by the tens place (because it's tens, not ones).
- Write numbers carefully to avoid confusion between tens and ones.
- Double-check your addition at the end.
- Board exam questions often ask for multiplication of 2-digit numbers like 34 × 15 or 47 × 23.
- Practice with real-life examples like prices, fruits, or counting objects.
Multiplication (2-digit) — Mcq
Multiplication (2-digit) — Mnemonic
🎉 Fun Mnemonics for 2-Digit Multiplication! 🎉
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1. The "BIG × SMALL" Trick 🐘🐁
When you multiply a big 2-digit number by a small 2-digit number, think:
"Big Elephant (big number) stomps Small Mouse (small number) step by step."
First, multiply the ones place, then the tens place, and add carefully!
Example: 23 × 12
Step 1: 3 × 2 = 6 🐁
Step 2: 20 × 2 = 40 🐘
Step 3: 3 × 10 = 30 🐁
Step 4: 20 × 10 = 200 🐘
Now add: 6 + 40 + 30 + 200 = 276 🎉
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2. Hindi Rhyming Fun: "गुना करो, जोड़ दो, जवाब लो!" ✍️📚
Remember this rhyme when multiplying:
"पहले गुना करो, फिर जोड़ दो, जवाब मिलेगा, चिंता छोड़ दो!"
(First multiply, then add, you will get the answer, don’t worry!)
This helps you multiply each digit and add all parts carefully.
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3. Acronym: M.A.D. = Multiply, Add, Double-check 🧠✨
When multiplying 2-digit numbers:
- Multiply each digit step by step.
- Add all the partial answers.
- Double-check your work to avoid mistakes!
Example: 34 × 21
Multiply: 4×1=4, 30×1=30, 4×20=80, 30×20=600
Add: 4 + 30 + 80 + 600 = 714
Double-check and smile! 😊
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