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I can't remember multiplication tables, is there any math trick for multiplication?

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    Do you know how to multiply numbers which are not decimals? Like $23 \times 518$ for example? – 2017-02-09
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    I have difficulty with multiplying or dividing decimal – 2017-02-09
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    Yes, but can you multiply or divide numbers that are not decimals? – 2017-02-09
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    Ya i can multiply those normal numbers – 2017-02-09

2 Answers 2

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Basically you count the number of decimals,

Consider $$45.2 \times 2.34$$

You do $$452 \times 234 = 105768$$

Notice how 45.2 has a decimal "one place" to the right, and 2.34 has a decimal "two places" to the right. Adding them up, we get "3 places to the right", for a final answer of $105.768$

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    Got the point thank you stack mate – 2017-02-09
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    Good thing I still commented even after you accepted an answer! No problem! – 2017-02-09
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Just do simple multiplication of numbers and place the decimal on the correct position
For Example:$$2.3\times5.18$$ Step $1:\text{Simple multiplication}$ $$23\times518=11914$$ Step $2:\text{Place the decimal}$ $$=11.914$$

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    Is there any logic behind shifting points – 2017-02-09
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    Where should the decimal be placed? What if both numbers are decimals? Please clarify your answer, thanks! – 2017-02-09
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    I mean what if two ✌ decimals and do a division ➗ – 2017-02-09
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    @shardulc Add the number of decimal places together. For example, from the answer above, $2.3$ has $1$ decimal place. $5.18$ has $2$ decimal places. So, the result will have $1+2 = 3$ decimal places. Also see the answer above this one. – 2017-02-11