Generalised form of a four-digit number abdc is
(a) 1000 a + 100 b + 10 c + d
(b) 1000 a + 100 c + 10 b + d
(c) 1000 a + 100 b + 10 d + c
(d) a × b × c × d

Solution:

The correct choice is (c).

The usual form of abdc can be written in its generalised form as:

a × 10³ + b × 10² + d × 10¹ + c × 10⁰

= 1000a + 100b + 10d + 10c

✦ Try This: Generalised form of a four-digit number acb is (a) a + 100 b + c, (b) 100a + 10c + b, (c) 100a + 10b + c, (d) a × c × b

The correct choice is (b)

☛ Also Check: NCERT Solutions for Class 8 Maths Chapter 16

NCERT Exemplar Class 8 Maths Chapter 13 Problem 1

Generalised form of a four-digit number abdc is (a) 1000 a + 100 b + 10 c + d, (b) 1000 a + 100 c + 10 b + d, (c) 1000 a + 100 b + 10 d + c, (d) a × b × c × d

Summary:

Generalised form of a four-digit number abdc is 1000 a + 100 b + 10 d + c

☛ Related Questions:

• Generalised form of a two-digit number xy is (a) x + y, (b) 10x + y, (c) 10x - y, (d) 10y + x
• The usual form of 1000a + 10b + c is (a) abc, (b) abco, (c) aobc, (d) aboc
• Let abc be a three-digit number. Then abc - cba is not divisible by (a) 9, (b) 11, (c) 18, (d) 33