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\\October 31, 2023 3:30 PM Bharat Arora Proof-3 Reader _________________________ Date: ___________________74

Practice time 1e

1. round off the following numbers to the nearest 10.
(a) 843 (b) 785 (c) 997 (d) 3265

(e) 7545 (f) 9048 (g) 10,200 (h) 14,563

2. round off the following numbers to the nearest 100.
(a) 2832 (b) 4567 (c) 5055 (d) 9398

(e) 7500 (f) 14,657 (g) 32,195 (h) 43,629

3. round off the following numbers to the nearest 1000.
(a) 23,471 (b) 43,805 (c) 60,030 (d) 1,24,350

(e) 3,45,552 (f) 9,85,832 (g) 7,54,325 (h) 8,32,981

romAn numerAls

There are seven basic symbols (letters of English alphabet) Knowledge Desk

in the Roman numerals. They are given in the following The Hindu-Arabic
system uses ten
table with their respective Hindu-Arabic numerals. symbols 0, 1, 2, 3, 4, 5,
roman Numerals I V X L C D M 6, 7, 8 and 9, evolved
from Brahmi numerals.
Hindu-Arabic Numerals 1 5 10 50 100 500 1000 Today, this system is
used worldwide.
A combination of these letters, when arranged in the
correct order, represents a counting system. Remember
Learn the mnemonic to remember
This system does not use place value to write the the sequence of Roman numeral:
numbers. In the Roman system, there is no symbol for I Value Xylophones Like
Cows Do Milk
zero. Instead, there are certain rules that need to be
Note
followed to represent the numbers according to this system. Only I, X, C and M can be

rule 1: If a symbol is repeated, its value is added as many repeated three times to
times as it occurs. write Roman numerals.

examples: (a) II = 1 + 1 = 2 (b) III = 1 + 1 + 1 = 3 (c) XX = 10 + 10 = 20

rule 2: If the smaller numeral is to the left of the bigger numeral, subtract it from
the bigger numeral.

examples: (a) IV = 5 – 1 = 4 (b) IX = 10 – 1 = 9 (c) XL = 50 – 10 = 40

rule 3: If the smaller numeral is to the right of the bigger numeral, add the two
numerals.

examples: (a) VI = 5 + 1 = 6 (b) XI = 10 + 1 = 11 (c) LX = 50 + 10 = 60

24 Mathematics-4