Digits and Number Forms
8 lessons · 16 questions · 3 PYQs
What the exams ask here
- how many digits in 2^a 5^b (Indore 2024 Q27 filed under logarithms)
- find a two/three-digit number from digit relations (reverse, sum, product)
- highest value of N / (digit sum) for a four-digit N (Indore 2021 Q19)
- 6389th digit of 123456789101112... (Indore 2019 Q18)
- four-digit number from product/difference conditions on its digits (Indore 2020 Q7)
- how many times the digit 4 is written from 1 to 500
- 4000th digit of 0.142857...
Lessons
- Start hereThe idea and the methodFirst lesson of Digits and Number Forms
- 1.Digit Count of 2^a × 5^bNew numbers every time (templates)5 min video
- 2.Number from digit relationsNew numbers every time (templates)
- 3.Digit sum ratio6 questionsIndore 2021
- 4.k-th Digit of 123456789101112...2 questions + fresh variantsIndore 2019 SA5 min video
- 5.Four digit number conditions6 questionsIndore 2020 SA
- 6.Digit occurrence count1 question
- 7.Recurring decimal kth digit1 question + fresh variants