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Multiplication Tricks: Multiplying Numbers with 9 Video Lecture | Quantitative Aptitude (Quant)

185 videos|158 docs|113 tests

FAQs on Multiplication Tricks: Multiplying Numbers with 9 Video Lecture - Quantitative Aptitude (Quant)

1. How can I multiply any number by 9 using a simple trick?
Ans. To multiply any number by 9, you can simply multiply the number by 10 and then subtract the original number from the result. For example, if you want to multiply 7 by 9, you can multiply 7 by 10 (which is 70) and then subtract 7 from 70 (which gives you 63).
2. Is this trick only applicable for single-digit numbers?
Ans. No, this trick can be used for any number, including multi-digit numbers. The process remains the same - multiply the number by 10 and subtract the original number from the result. For example, if you want to multiply 23 by 9, you can multiply 23 by 10 (which is 230) and then subtract 23 from 230 (which gives you 207).
3. Can this trick be used for decimal numbers as well?
Ans. Yes, this trick can be used for decimal numbers too. Simply multiply the decimal number by 10 and subtract the original decimal number from the result. For example, if you want to multiply 4.5 by 9, you can multiply 4.5 by 10 (which is 45) and then subtract 4.5 from 45 (which gives you 40.5).
4. Are there any other multiplication tricks for numbers with 9?
Ans. Yes, apart from the trick mentioned above, there are other multiplication tricks for numbers with 9. One such trick is to multiply the number by 9 and then subtract the original number from the result. For example, if you want to multiply 6 by 9, you can multiply 6 by 9 (which is 54) and then subtract 6 from 54 (which gives you 48).
5. Can this trick be used for numbers greater than 9?
Ans. Yes, this trick can be used for numbers greater than 9 as well. The process remains the same - multiply the number by 10 and subtract the original number from the result. For example, if you want to multiply 15 by 9, you can multiply 15 by 10 (which is 150) and then subtract 15 from 150 (which gives you 135).
185 videos|158 docs|113 tests

Timeline

00:08 Multiplication using our fingers
00:12 Multiplying single-digit number with 9
01:12 Multiplication using our fingers & toes
01:26 Multiplying two-digit number with 9
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