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ihazaquestion
ihazaquestion asks:
Q:

what is 156 times 945

In Topics: Helping my child with math
> 60 days ago

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jirwin
jirwin writes:
It is 147420.
> 60 days ago

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bob
bob , Parent writes:
When I was a child, we did multiplication by slide rule.  The process works by adding logarithms.  The solution to your problem is

  (log 156 + log 945)
10

or "ten raised to the power of the sum of the logarithm of 156 plus the logarithm of 945"

log 156 = 2.1931245983544615969290108506464
log 945 = 2.9754318085092629473835610736335
     sum = 5.1685564068637245443125719242799

ten raised the the 5.1685564068637245443125719242799 power is 147,420

no multiplication required!
> 60 days ago

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