How can i use mental math to find the product of 60 and 1/2?

Question

1815 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-05-06T01:04:30

#30#

The product of two numbers is those two numbers multiplied by each other.

Multiplying something by a fraction results in dividing that number by the reciprocal of the fraction:

#a*b/c=a/(c/b)#

In this case, #60*1/2=60/(2/1)=60/2#

Think of a number that can add itself to equal #60#:

#30+30=60#

Answer 2 · 2018-05-06T01:07:21

The answer is 30!

Here’s one way:

60 is the same as #60/1# so, now make it #60/1*1/2#

Now, multiply the numerators and denominators by doing simple math:

Numerators: 601=60
Denominators: 12=2

Then, you get #60/2.# Now it’s simple division.

What’s half of 60?

30!!

Hopefully you’ll be able to do that...mentally ;)