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Class 824 Class 924 Class 1036

SubjectAll Physics 19 Chemistry 19 Biology 19 Mathematics 27

ChapterAll Algebraic Expressions and Identities Comparing Quantities Exponents and Powers Linear Equations in One Variable Mensuration Squares and Square Roots

Showing 1 question in Mathematics for Class 8. Tap a card to reveal the answer.

MathematicsExponents and Powersmedium

Express 0.0000073 in standard (scientific) form.

Reveal answer ↓

What it is

Standard form writes very large or very small numbers as a x 10^n.

Answer

Move the decimal point to just after the first non-zero digit to get 7.3. The point moved 6 places to the right, so we multiply by 10 raised to the power -6. Therefore 0.0000073 = 7.3 x 10^-6.

Standard form: a x 10^n, where 1 <= a < 10

•Bring one non-zero digit before the decimal
•Count places moved = 6 (moving right -> negative power)
•= 7.3 x 10^-6

Why learn this

Scientists write an atom's mass or a galaxy's size this way - it kills long strings of zeros.

💡 Memory trick

Move the point, count the hops; hopping right gives a negative power.