🔢 Part 1: Understanding Three-Digit Numbers

Hundreds: _______ Tens: _______ Ones: _______

➕ Part 2: Adding Three-Digit Numbers

Step 1: Add the hundreds: 200 + 300 + 100 = _______

Step 2: Add the tens: 10 + 20 + 50 = _______

Step 3: Add the ones: 4 + 5 + 3 = _______

Total: _______ + _______ + _______ = _______

a) 123 + 234 + 112 = _______

b) 315 + 142 + 203 = _______

c) 456 + 123 + 321 = _______

🎯 Part 3: Estimation and Reasonableness

Problem: 189 + 234 + 176

Round to nearest hundred: _____ + _____ + _____ = _____ (estimate)

Actual calculation:

Is your answer reasonable? Circle: Yes / No

🧮 Part 4: Problem Solving

Answer: They raised $_______ altogether.

Answer: The library has _______ books in total.

✅ Part 5: Self-Assessment