Adding Hundreds and Tens

🎯 What You'll Learn

You will learn to add numbers that have both hundreds and tens, like ₦150 + ₦230.

🏪 Market Story

Bola's family is saving for a new cooking pot. Bola's mother has ₦350 and her father adds ₦240. How much do they have together? Bola adds: hundreds first: 300 + 200 = 500. Then tens: 50 + 40 = 90. Total: ₦500 + ₦90 = ₦590.

📝 Let's Learn

Add hundreds first, then tens, then ones. This is partitioning with bigger numbers.

Example 1: ₦120 + ₦150. Hundreds: 100 + 100 = 200. Tens: 20 + 50 = 70. Total: ₦270.

Example 2: ₦230 + ₦340. Hundreds: 200 + 300 = 500. Tens: 30 + 40 = 70. Total: ₦570.

Example 3: ₦175 + ₦220. Hundreds: 100 + 200 = 300. Tens: 70 + 20 = 90. Ones: 5 + 0 = 5. Total: ₦395.

✏️ Practice Questions

1. ₦210 + ₦130 = ?
2. ₦450 + ₦320 = ?
3. Emeka earns ₦250 on Saturday and ₦180 on Sunday. How much did he earn over the weekend?

Click to see answers

1. ₦210 + ₦130 = ₦340. Hundreds: 200 + 100 = 300. Tens: 10 + 30 = 40.
2. ₦450 + ₦320 = ₦770. Hundreds: 400 + 300 = 700. Tens: 50 + 20 = 70.
3. ₦250 + ₦180 = ₦430. Hundreds: 200 + 100 = 300. Tens: 50 + 80 = 130. Total: 300 + 130 = 430.

💡 Remember

To add big numbers, partition them into hundreds, tens, and ones. Add each part separately, then combine. You can handle any number this way!