MathGrade 2nd· Tips & Tricks > Addition
The Magic 9 Trick!
Adding & Subtracting 9 the FAST Way!
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Video coming soon!
About This Lesson
Learn a super cool shortcut to add or subtract 9 instantly! When you add 9, the tens go UP by 1 and the ones go DOWN by 1. It works because 9 is just 10 minus 1!
What You'll Learn
- Adding 9 = Add 10, Subtract 1
- Subtracting 9 = Subtract 10, Add 1
- Tens go UP, Ones go DOWN when adding 9
- Tens go DOWN, Ones go UP when subtracting 9
- 9 is just 10 minus 1!
Try It Yourself!
8 + 9 = ?
34 + 9 = ?
41 - 9 = ?
65 - 9 = ?
Quick Reference
+9: Tens UP 1, Ones DOWN 1 (e.g. 27+9=36) | -9: Tens DOWN 1, Ones UP 1 (e.g. 36-9=27)
Lesson Info
Grade 2nd
2026-01-27
Tips & Tricks > Addition
Keywords
2nd grade mathaddition trickssubtraction tricksmental mathmagic 9math for kidsmath shortcuts
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