Subtracting from Larger Numbers

🎯 What You'll Learn

You will learn to subtract from ₦500 and ₦1,000 — amounts you encounter with larger Naira notes.

🏪 Market Story

Emeka's mother gives him a ₦500 note to buy provisions. He spends ₦320. How much should he bring back? ₦500 − ₦320 = ₦180. Let's learn how to do this.

📝 Let's Learn

Subtracting from 500: Think of it as 500 = 400 + 100. Or use counting up from the price to 500.

Subtracting from 1,000: Subtract from each place: ones from 10, tens from 9, hundreds from 9.

Example 1: ₦500 − ₦320. Count up from 320: 320 + 80 = 400, 400 + 100 = 500. Change: 80 + 100 = ₦180.

Example 2: ₦1,000 − ₦650. Ones: 10 − 0 = 0. Tens: 9 − 5 = 4. Hundreds: 9 − 6 = 3. Answer: ₦350.

Example 3: ₦1,000 − ₦475. Ones: 10 − 5 = 5. Tens: 9 − 7 = 2. Hundreds: 9 − 4 = 5. Answer: ₦525.

✏️ Practice Questions

1. ₦500 − ₦250 = ?
2. ₦1,000 − ₦380 = ?
3. Amina pays ₦1,000 for a dress costing ₦735. How much change?

Click to see answers

1. ₦500 − ₦250 = ₦250. Exactly half!
2. ₦1,000 − ₦380 = ₦620. Ones: 10 − 0 = 0. Tens: 9 − 8 = 1... wait, let's use counting up: 380 + 20 = 400, 400 + 600 = 1000. Change: 20 + 600 = 620.
3. ₦1,000 − ₦735 = ₦265. Ones: 10 − 5 = 5. Tens: 9 − 3 = 6. Hundreds: 9 − 7 = 2.

💡 Remember

For ₦1,000, use the same trick as ₦100 but with three digits: ones from 10, tens from 9, hundreds from 9. Counting up also works well for any amount!