Single Digit × Double Digit

🎯 What You'll Learn

You will learn to multiply a single-digit number by a two-digit number using partitioning.

🏪 Market Story

Chidi needs to buy 3 shirts at ₦25 each. He thinks: 3 × ₦25. He splits 25 into 20 + 5. Then: 3 × 20 = 60 and 3 × 5 = 15. Add them: 60 + 15 = ₦75. The 3 shirts cost ₦75!

📝 Let's Learn

To multiply a single digit by a two-digit number, partition the two-digit number:

1. Split the two-digit number into tens and ones.
2. Multiply each part separately.
3. Add the results.

Example 1: 4 × 13. Split 13 = 10 + 3. 4 × 10 = 40. 4 × 3 = 12. Total: 40 + 12 = 52.

Example 2: 5 × 24. Split 24 = 20 + 4. 5 × 20 = 100. 5 × 4 = 20. Total: 100 + 20 = 120.

Example 3: 3 × 32. Split 32 = 30 + 2. 3 × 30 = 90. 3 × 2 = 6. Total: 90 + 6 = 96.

✏️ Practice Questions

1. What is 2 × 34?
2. What is 4 × 15?
3. Funke buys 3 bags of rice at ₦45 each. What is the total? (Partition 45 into 40 + 5.)

Click to see answers

1. 2 × 34 = 2 × 30 + 2 × 4 = 60 + 8 = 68.
2. 4 × 15 = 4 × 10 + 4 × 5 = 40 + 20 = 60.
3. 3 × 45 = 3 × 40 + 3 × 5 = 120 + 15 = ₦135.

💡 Remember

To multiply by a two-digit number, split it into tens and ones, multiply each part, then add. This works every time!