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Mathematics ⇒ Multiply numbers that are close to 50 with easeViews: 1610

Multiply numbers that are close to 50 with ease

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#Examples

>>> 48 * 46

#Step 1: Subtract 50 from both of them

>>> 48 - 50 = -2

>>> 46 - 50 = -4

#Step 2: Cross add the result to the numbers

>>> 48 - 4 = 44

>>> 46 - 2 = 44

#Step 3: Add two zeros to one of them and divide the result by two

>>> 4400 / 2 = 2200

#Step 4 (final): Multiply the results in #step 1 together and add it to the result in #step 3

>>> (-2 * -4) = 8

>>> 2200 + 8 = 2208 (Answer)

Pretty cool isn't it?

Let take another example

#Multiply 42 * 57

#Step 1: Subtract 50 from both of them

>>> 42 - 50 = -8

>>> 57 - 50 = +7

#Step 2: Cross add the result to the numbers

>>> 42 + 7 = 49

>>> 57 - 8 = 49

#Step 3: Add two zeros to one of them and divide the result by two

>>> 4900 / 2 = 2450

#Step 4 (final): Multiply the results in #step 1 together and add it to the result in #step 3

>>> (-8 * +7) = -56

>>> 2450 + (-56) = 2450 - 56

>>> 2394 (Answer)

Try this and leave your answer as a comment below

>>> 48 * 52

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Started by: Prodigy on Feb 26, 2015

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