Test Your Knowledge: Subtraction Facts within 20 (Grade 2)

📚 Quick Study Guide

• 🍎 Subtraction Basics: Subtraction means taking away one number from another. The result is called the difference.
• 🔢 Subtraction Facts within 20: These are subtraction problems where the numbers involved (both the number you start with and the number you subtract) are 20 or less.
• 💡 Key Strategy - Counting Backwards: A simple way to subtract is to count backwards on a number line or in your head. For example, to solve $15 - 3$, start at 15 and count back 3 steps: 14, 13, 12. So, $15 - 3 = 12$.
• 📝 Using Your Fingers: If you're subtracting a small number, you can use your fingers to help. For example, for $9 - 2$, hold up 9 fingers, then put down 2. You'll have 7 left!
• ➕ Relationship with Addition: Subtraction is the opposite of addition. If you know that $8 + 5 = 13$, then you also know that $13 - 5 = 8$ and $13 - 8 = 5$.

➕ Practice Quiz

1. What is $12 - 5$?
   1. 6
   2. 7
   3. 8
2. Solve: $18 - 9 = ?$
   1. 8
   2. 9
   3. 10
3. What is $14 - 6$?
   1. 7
   2. 8
   3. 9
4. Calculate $11 - 4$.
   1. 6
   2. 7
   3. 8
5. What is the result of $16 - 8$?
   1. 7
   2. 8
   3. 9
6. Find the answer to $19 - 7$.
   1. 11
   2. 12
   3. 13
7. What is $20 - 3$?
   1. 16
   2. 17
   3. 18