Test questions for standard algorithm addition of 2 and 3-digit numbers

📚 Quick Study Guide

• 🔢 Place Value is Key: Always line up numbers according to their place value (ones, tens, hundreds). Misalignment is a common source of errors!
• ➕ Start with the Ones: Begin adding from the rightmost column (the ones place).
• 🤝 Regrouping (Carrying Over): If the sum of a column is 10 or greater, regroup. Write the ones digit of the sum and carry over the tens digit to the next column to the left. For instance, if $7 + 5 = 12$, write down '2' and carry over '1'.
• ➡️ Move Leftwards: After the ones, add the tens column, then the hundreds column, and so on, remembering to include any regrouped numbers.
• 🧐 Double Check: Review your work to ensure accuracy. A simple check can prevent careless mistakes.
• 📝 Example (2-digit): $37 + 25 = ?$. First, $7 + 5 = 12$. Write '2', carry-over '1'. Then, $1 + 3 + 2 = 6$. Answer: 62
• 💡 Example (3-digit): $145 + 236 = ?$. First, $5 + 6 = 11$. Write '1', carry-over '1'. Then, $1 + 4 + 3 = 8$. Finally, $1 + 2 = 3$. Answer: 381

Practice Quiz

1. What is $45 + 32$?
   1. 67
   2. 77
   3. 87
   4. 97
2. Calculate $123 + 56$.
   1. 169
   2. 179
   3. 189
   4. 199
3. Find the sum of $68 + 21$.
   1. 79
   2. 89
   3. 99
   4. 109
4. What is $256 + 143$?
   1. 389
   2. 399
   3. 409
   4. 419
5. Compute $37 + 55$.
   1. 82
   2. 92
   3. 102
   4. 112
6. Determine $418 + 271$.
   1. 589
   2. 689
   3. 789
   4. 889
7. Add $72 + 19$.
   1. 81
   2. 91
   3. 101
   4. 111