Page 30 - Start Up Mathematics_6

6. Estimation involves approximating a quantity according to the situation and accuracy required.

7. Roman numerals:
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000

Review Exercises

Multiple ChoiCe Questions

1. The difference between the place value and face value of 3 in the numeral 6,530 is:
(a) 3 (b) 27 (c) 33 (d) 0
2. The greatest whole number is:

(a) 1 billion (b) 10 crore (c) 10 lakh (d) none of these
3. The largest four-digit number having distinct digits is:
(a) 9,000 (b) 9,867 (c) 9,768 (d) 9,876

4. The number 14,349 when rounded off to the nearest hundreds is:
(a) 14,000 (b) 14,300 (c) 15,000 (d) 14,400
5. The equivalent of 44 in Roman numeral is:

(a) XXXXIV (b) XLIIII (c) XLIV (d) IVIV
6. The smallest natural number which on rounding off to the nearest hundreds gives 400 is:

(a) 399 (b) 401 (c) 449 (d) 350
7. The sum of place value of all the digits of the number 6,001 is:
(a) 7 (b) 61 (c) 6,001 (d) 6,000

8. While adding two four-digit numbers the closest estimate will be obtained by rounding each
number to the nearest:
(a) ones (b) tens (c) hundreds (d) thousands

solve Mentally
True or False

1. The place value of a digit is independent of whether the number is written in Indian system
or International system of numeration.

2. In Roman numerals, the digits do not have any place value.
3. In the Roman numeral system, the symbol VC represents the number 95.

4. In International system of numeration, a number having more number of digits is always
greater than the number having less number of digits.
5. Rounding off each number to the nearest tens before performing the required operation gives
more accurate estimate than rounding off each number to the nearest hundreds or thousands.

Fill in the Blanks
1. The face value of digit 3 in the number 3,284 is ______________.
2. The place value of digit 7 in the number 6,721 is ______________.

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