Page 18 - Start Up Mathematics_4

4. If the face values of the digits at the lakhs, ten thousands and thousands place are
the same, then compare the face values of the digits at the hundreds place.

L TTh Th H T O

7 9 2 8 4 3

7 9 2 3 1 5

Same 8 > 3

So, 7,92,843 > 7,92,315.

Similarly, we can compare the face values of the digits at the tens and ones place to know
which number is greater.

Predecessor and Successor

A number one less than a given number comes just before it and is called its predecessor.

A number one more than a given number comes just after it and is called its successor.
Consider a 5-digit number 16,832.

Its predecessor = 16,832 – 1 = 16,831 and its successor = 16,832 + 1 = 16,833.
16,831 16,832 16,833

↓ ↓ ↓
predecessor is between successor
16,831 and 16,833

Ordering of Numbers

Numbers can be arranged either in ascending order (smaller to bigger) or descending order
(bigger to smaller). For example,
28,963; 28,972; 29,531; 29,537 are in ascending order.

78,421; 78,375; 76,240; 75,189 are in descending order.

EXERCISE 1.2

1. Write in the expanded form.
(a) 71,428 (b) 63,907 (c) 89,991 (d) 40,052

(e) 3,92,145 (f) 9,06,784 (g) 6,59,122 (h) 5,84,096
2. Write in the standard form.

(a) 8,00,000 + 70,000 + 3,000 + 400 + 80 + 2
(b) 8,00,000 + 10,000 + 900 + 50 + 4
(c) 5 lakhs + 3 thousands + 9 hundreds + 4 ones

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