Real-world examples of adding and subtracting 10 mentally (Grade 2)

📚 Real-World Mental Math: Adding & Subtracting 10 (Grade 2)

Mental math is all about doing math in your head! Adding or subtracting 10 is a skill we use all the time. Here's how to master it:

Quick Study Guide

• ➕ Adding 10: When you add 10, only the tens digit changes. For example, $23 + 10 = 33$.
• ➖ Subtracting 10: When you subtract 10, only the tens digit changes. For example, $58 - 10 = 48$.
• 🔢 Number Line: Imagine a number line. Adding 10 moves you 10 places to the right, and subtracting 10 moves you 10 places to the left.
• 💡 Tips: Focus on the tens place. The ones place stays the same!

Practice Quiz

1. What is $34 + 10$?
   1. 44
   2. 24
   3. 35
2. What is $67 - 10$?
   1. 77
   2. 57
   3. 66
3. If you have 25 apples and get 10 more, how many apples do you have?
   1. 15
   2. 35
   3. 26
4. What is $82 - 10$?
   1. 92
   2. 72
   3. 81
5. What is $19 + 10$?
   1. 9
   2. 29
   3. 109
6. You have 41 stickers and give 10 away. How many stickers do you have left?
   1. 51
   2. 31
   3. 40
7. What is $53 + 10$?
   1. 43
   2. 63
   3. 54