Using VERTICALLY AND CROSSWISE you do not need to the multiplication tables beyond 5 X 5.
* Suppose you need 8 x 7
8 is 2 below 10 and 7 is 3 below 10.
Think of it like this:
The answer is 56.
The diagram below shows how you get it.
8 2
7 3
-------------------
5 6
You subtract crosswise 8-3 or 7 - 2 to get 5,
the first figure of the answer.
And you multiply vertically: 2 x 3 to get 6,
the last figure of the answer.
what is the reason for 8-3 and 7-2.why cant i add them.why you multiplied 2 and 3. it is mathematics dont do experiments
ReplyDeleteDear Surya4u,
ReplyDeleteIm trying to post a statistical problem in your site, but despite i logged in, i did not find where or how can i do that. could you advice me on this first please, :)?
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Agus
An urn contains 3 red balls and 7 white balls.a ball is drawn from the urn and a ball of the colour is then put in to the urn.a second ball is drawn from the urn.if both balls were of the same colour,what is the probabiility that they were both white?
ReplyDeletei got the answer as 49/58 but the materials shows 49/56 .please clarify?