FAQs on Subtraction and Multiplication Tricks

Question 1

1. How do I multiply two-digit numbers quickly without a calculator?

Accepted Answer

Ans. Two-digit multiplication tricks like the Vedic method or cross-multiplication allow instant mental calculation. For example, 23 × 24 can be solved by multiplying the tens digits, then cross-multiplying units and tens separately, combining results efficiently. Practice with patterns helps develop speed for competitive exams like CAT where time-saving techniques matter significantly.

Question 2

2. What's the fastest way to subtract large numbers to avoid silly mistakes?

Accepted Answer

Ans. Complement subtraction and left-to-right techniques reduce errors in mental maths. Instead of borrowing repeatedly, convert subtraction to addition using complements-for instance, subtract 467 from 1000 by finding 1000 - 467 = 533 using digit complements. This method minimises mental load and improves accuracy during timed quantitative sections.

Question 3

3. Are there tricks to multiply numbers ending in 5 faster than normal methods?

Accepted Answer

Ans. Numbers ending in 5 follow a special pattern: multiply the tens digit by its successor, then append 25. For example, 45 × 45 becomes 4 × 5 = 20, so the answer is 2025. This shortcut saves seconds during CAT's quantitative aptitude section, especially with square calculations.

Question 4

4. How can I recognise which multiplication trick applies to different number patterns?

Accepted Answer

Ans. Identify patterns first: numbers ending in 5, numbers close to 100 or powers of 10, and numbers with repeating digits each use distinct methods. The Nikhilam sutra works for numbers near base values, while vertical-horizontal methods suit random digit combinations. Practising mind maps and flashcards on subtraction and multiplication tricks helps students internalise recognition instantly.

Question 5

5. Why do some mental maths tricks work but others feel confusing during exams?

Accepted Answer

Ans. Tricks become intuitive only through repeated practice, not memorisation alone. Students often rush application without understanding underlying logic-Vedic methods rely on digit relationships, not magic. Consistent drill with worksheets on multiplication and subtraction strategies builds confidence, reducing panic during CAT's time-pressured quantitative problems where accuracy and speed both matter equally.

Subtraction and Multiplication Tricks Video Lecture - Quantitative Aptitude

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