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Java Games: Flashcards, matching, concentration, and word search. |
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Multiplication Tricks with 9s using subtraction
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| A | B |
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| 9x0 | 0 (zero rule) |
| 9x1 | 10-1=9 |
| 9x2 | 20-2=18 |
| 9x3 | 30-3=27 |
| 9x4 | 40-4=36 |
| 9x5 | 50-5=45 |
| 9x6 | 60-6=54 |
| 9x7 | 70-7=63 |
| 9x8 | 80-8=72 |
| 9x9 | 90-9=81 |
| 9x10 | 90 (tens trick) |
| 9x11 | 99 (elevens trick) |
| 9x12 | Since 11x9=99, 12x9 is one more 9, which is 99+9, which equals 108 |
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Third Grade Teacher |
| Southern California, CA |
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