Subtraction Facts - up to 20
⚡️ It's the Final Exam for Subtraction Ninjas! Mix all your strategies together to blast through these subtraction facts.
Concept
You possess all the strategies to be a subtraction master: 1. **Count Back** (For -1, -2, -3) 2. **Count On/Distance** (For things that are close, like 18 - 16) 3. **Step on 10 / Make Ten** (For hard teen problems) 4. **Un-Doubles** (Like 14 - 7) 5. **Magic 9 Rule** (Add the digits!) 6. **Magic 8 Rule** (Add 2 to the ones digit!) Your ultimate goal is **Fluency**: seeing a problem and instantly pulling the right trick out of your toolkit to solve it in seconds!
Try it
Lightning Round: Subtraction Master! **Instructions:** Look at each problem. Choose your fastest strategy and write the answer. **Level 1: Quick Tricks** 1. 14 - 9 = ___ (Hint: Magic 9!) 2. 12 - 6 = ___ (Hint: Double!) 3. 15 - 2 = ___ (Hint: Count back!) **Level 2: Step on 10** 4. 15 - 7 = ___ 5. 13 - 5 = ___ 6. 12 - 5 = ___ **Level 3: The Big Ones** 7. 17 - 8 = ___ (Hint: Magic 8 rule, +2 the ones place!) 8. 16 - 9 = ___ 9. 14 - 8 = ___ 10. 19 - 18 = ___ (Hint: Count on! They are close!) **🏆 Champion Question:** Which subtraction trick was your favorite to learn, and why?