Addition Review and Challenge

🎯 What You'll Learn

You will review everything you have learned about addition and test yourself with challenge problems.

🏪 Market Story

It's the end of the week, and Emeka's teacher, Mrs. Okafor, gives the class an addition challenge. "Let's see who has been paying attention!" she says. Emeka is ready. He knows how to add small numbers, big numbers, and use strategies like Make 10 and Doubles.

📝 Let's Learn

Review of all the strategies you have learned:

• Counting on: Start from the bigger number and count up.
• Make 10: Break a number to make 10 first, then add the rest.
• Doubles: If numbers are the same or close, use doubles.
• Partitioning: Split numbers into hundreds, tens, and ones.
• Carrying: When ones add to more than 9, carry to the tens.

Challenge 1: ₦78 + ₦45. Ones: 8 + 5 = 13, write 3 carry 1. Tens: 7 + 4 + 1 = 12, write 2 carry 1. Hundreds: 1. Answer: ₦123.

Challenge 2: ₦256 + ₦189. Ones: 6 + 9 = 15, write 5 carry 1. Tens: 5 + 8 + 1 = 14, write 4 carry 1. Hundreds: 2 + 1 + 1 = 4. Answer: ₦445.

Challenge 3: ₦99 + ₦99. Think of it as ₦100 + ₦100 - ₦2 = ₦198. Or use carrying: 9+9=18, write 8 carry 1, 9+9+1=19, write 9 carry 1. Answer: ₦198.

✏️ Practice Questions

1. ₦67 + ₦88 = ?
2. ₦345 + ₦127 = ?
3. Amina has ₦275. She earns ₦168 more. How much does she have now?

Click to see answers

1. ₦67 + ₦88 = ₦155. Ones: 7 + 8 = 15, write 5 carry 1. Tens: 6 + 8 + 1 = 15, write 5 carry 1. Hundreds: 1.
2. ₦345 + ₦127 = ₦472. Ones: 5 + 7 = 12, write 2 carry 1. Tens: 4 + 2 + 1 = 7. Hundreds: 3 + 1 = 4.
3. ₦275 + ₦168 = ₦443. Ones: 5 + 8 = 13, write 3 carry 1. Tens: 7 + 6 + 1 = 14, write 4 carry 1. Hundreds: 2 + 1 + 1 = 4.

💡 Remember

You have learned many ways to add. Choose the strategy that works best for each problem. With practice, addition will become fast and automatic. Well done!