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E:\Working\Focus_Learning\Math_Genius_4_(25-10-2023)\Open_Files\Chap-01
\\December 6, 2023 1:30 PM Bharat Arora P-6 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)

in the Roman numerals. Knowledge Desk

They are given in the following table with their respective The Hindu-Arabic
system uses ten
Hindu-Arabic numerals. symbols 0, 1, 2, 3, 4, 5,
6, 7, 8 and 9, evolved
roman Numerals I V X L C D M from Brahmi numerals.
Hindu-Arabic Numerals 1 5 10 50 100 500 1000 Today, this system is
used worldwide.
The first ten Roman numerals are:

I II III IV V VI VII VIII IX X Remember

1 2 3 4 5 6 7 8 9 10 There is no symbol for zero.
rules for Writing roman numerals

rule 1: Repetition of a Roman numeral means addition.
examples: (a) II = 1 + 1 = 2 (b) XX = 10 + 10 = 20

(c) CCC = 100 + 100 + 100 = 300

Notes: 1. The symbols I, X, C and M can be repeated up to three times only.

2. V, L and D are not repeated.

rule 2: A smaller numeral written to the right of a larger numeral is always added
to the larger numeral.

examples: (a) XVII = 10 + 5 + 1 + 1 = 17 (b) LXV = 50 + 10 + 5 = 65
(c) CX = 100 + 10 = 110

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