Free Knowing Our Numbers 03 Practice Test - 6th grade 

Question 1

The collection of numbers which start with the predecessor of 1 are known as _____.

A. Whole numbers
B. Natural Numbers
C. Integers
D. Prime Numbers

SOLUTION

Solution : A

Whole numbers start from 0 and it is the number system which starts with the predecessor of 1.

Question 2

Expand  34879.

A. 3×10000+4×1000+7×10+9×1
B. 3×10000+4×1000+8×100+7×10+9×0
C. 3×10000+4×1000+8×100+7×10+9×1
D. 3×10000+4×100+8×100+7×10+9×1

SOLUTION

Solution : C

In 34879, 3 is in 10000's place, 4 is in 1000's place, 8 is in 100's place, 7 is in 10's place and 9 is in 1's place.

So, 34879=3×10000+4×1000+8×100+7×10+9×1

Question 3

Insert commas suitably and write the number, 50801592 according to the Indian number system. 

A. 5,08,01,592
B. 50,80,15,92
C. 508,015,92
D. 5,08,0,1592

SOLUTION

Solution : A

According to Indian number system, correct way to write 50801592 is 5,08,01,592.

Question 4

Estimate: 5,873 - 436 to the nearest hundreds.

A. 5900
B. 6000
C. 5400
D. 5600

SOLUTION

Solution : C

5873 - 436 =  5437
5437 is less than 5450, the mid point of 5400 and 5500. 

Hence, 5437 rounded off to the nearest hundreds is 5400.

Question 5

XLVI + LXX   =     ______

A. CXIV
B. CXVI
C. XCIV
D. XCVI

SOLUTION

Solution : B

Let us first convert the Roman numerals into Hindu-Arabic numerals.

When a Roman numeral with the larger value is on the left, we add the values together and when it is on the left, we subtract the values.

∴ XLVI = (50 - 10 ) + 5 + 1
             = 56 - 10
             = 46
LXX = 50 + 10 + 10
        = 70

∴ XLVI + LXX = 46 + 70 = 116

But, 116 = 100 + 16 = C + XVI = CXVI.

∴ XLVI + LXX = CXVI

Question 6

The smallest three-digit number that can be formed using 6, 3 and 8 without repetition is ___.

SOLUTION

Solution :

Using the digits 6, 3 and 8 the smallest number that can be formed is 368 and the largest will be 863.

Question 7

If in number 9846768


__

SOLUTION

Solution :

Place value of 6 at I = 6000

Place value of 6 at II = 60

⇒Place value of 6 at IPlace value of 6 at II=600060

= 100

Question 8

Forty lakh seventy thousand and eight can be written using numerals as ___ .

SOLUTION

Solution :

Forty lakh seventy thousand and eight = 40,70,008.

Question 9

In a set of natural numbers there exists a definite largest number.

A.

True

B.

False

SOLUTION

Solution : B

In a set of natural numbers, the largest number cannot be determined.

Question 10

Pavan says 1 lakh = Ten Thousand. Is he correct?

A.

True

B.

False

SOLUTION

Solution : B

1 Lakh = 100000
1 Thousand = 1000

∴1Lakh=HundredThousand

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