Page 17 - Viva

4. Write the standard form of the following.

(a) 2000 + 300 + 40 + 8 (b) 5000 + 200 + 20 + 3

(c) 4000 + 800 + 90 + 0 (d) 7000 + 500 + 40 + 1

(e) 9 Th + 1 H + 9 T + 6 O (f) 2 Th + 4 H + 5 T + 7 O

Comparison of Numbers
We have already learnt how to compare numbers up to three digits. Now we will learn to
compare 4-digit numbers.

Example 6: Compare 289 and 6246.
Top Tip
Solution: 289 is a 3-digit number whereas 6246 is a When the number of
4-digit number. digits are different in the
4-digit number > 3-digit number given numbers, then the
number with more digits
So, 6246 > 289. is greater.

Example 7: Compare 4890 and 4891.

Solution: When the number of digits is the same, start comparing from the leftmost
digit, i.e., the digit at the thousands place.

The digits at the thousands, hundreds and tens place are the same in both
the numbers. Thus, compare the digits at the ones place.
The digit at the ones place in 4890 is 0 and in 4891 is 1.

Since 0 < 1, therefore 4890 < 4891.

Ascending and Descending Order

Numbers can be arranged in a sequence from bigger to smaller or from smaller to bigger.
Writing numbers in order from smaller to bigger is called ascending order.

Writing numbers in order from bigger to smaller is called descending order.

Example 8: Write the given numbers in ascending and descending order.
7428, 3992, 9419, 3895

Solution: Ascending order: 3895, 3992, 7428, 9419 or 3895 < 3992 < 7428 < 9419

Descending order: 9419, 7428, 3992, 3895 or 9419 > 7428 > 3992 > 3895

Before, After and Between

Numbers which follow one after the other are called consecutive numbers. For example,
1316, 1317, 1318, 1319 and 1320 are consecutive numbers.

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