In standard form, the number 72105.4 is written as 7.21054 × 10ⁿ where n is equal to
a. 2
b. 3
c. 4
d. 5

Solution:

Given

Number 72105.4 is written as 7.21054 × 10ⁿ

If the number is greater than or equal to 10, then the power of 10 is a positive integer which is equal to the number of places the decimal point is shifted.

72105.4 = 7.21054 × 10⁴

Therefore, the value of n is equal to 4.

✦ Try This: In standard form, the number 63214.4 is written as 6.32144 × 10ⁿ where n is equal to

Given

Number 63214.4 is written as 6.32144 × 10ⁿ

If the number is greater than or equal to 10, then the power of 10 is a positive integer which is equal to the number of places the decimal point is shifted.

63214.4 = 6.32144 × 10⁴

Therefore, the value of n is equal to 4

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 13

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NCERT Exemplar Class 7 Maths Chapter 11 Problem 11

In standard form, the number 72105.4 is written as 7.21054 × 10ⁿ where n is equal to: a. 2, b. 3, c. 4, d. 5

Summary:

In standard form, the number 72105.4 is written as 7.21054 × 10ⁿ where n is equal to 4.

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☛ Related Questions:

• Square of (-2/3) is: a. -2/3, b. 2/3, c. -4/9, d. 4/9
• Cube of (-1/4) is: a. -1/12, b. 1/16, c. -1/64, d. 1/64
• Which of the following is not equal to (-5/4)4: a. (-5)4/44, b. 54/(-4)4, c. -54/44, d. (-5/4) × (-5 . . . .