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SAI International School
Grade -VIII
Mathematics
CHAPTER-12: EXPONENTS AND POWERS
LESSON NOTE:1
SUBTOPICS: , POWERS WITH NEGATIVE
EXPONENTS,LAWS OF EXPONENTS
Introduction:
Mass of earth is 5,970,000,000,000, 000, 000, 000, 000 kg. We have already
learnt in earlier class how to write such large numbers more conveniently using
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exponents, as, 5.97 × 10 kg.
Powers with 0 exponents:
The value is always 1
0
0
Eg- 5 = 1 a = 1
Powers with negative exponents:
In general, we can say that for any non-zero integer a,
a – m =
–m
m
where m is apositive integer. a is the multiplicative inverse of a .
뛐
Examples: , ,
뛐
Laws of Exponents:
