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

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closed as too broad by Shailesh, ervx, Morgan Rodgers, iadvd, pjs36 Feb 9 '17 at 4:49

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Do you know how to multiply numbers which are not decimals? Like $23 \times 518$ for example? $\endgroup$ – shardulc Feb 9 '17 at 2:55
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    $\begingroup$ I have difficulty with multiplying or dividing decimal $\endgroup$ – Sid Patil Feb 9 '17 at 2:57
  • $\begingroup$ Yes, but can you multiply or divide numbers that are not decimals? $\endgroup$ – shardulc Feb 9 '17 at 3:04
  • $\begingroup$ Ya i can multiply those normal 🔢 numbers $\endgroup$ – Sid Patil Feb 9 '17 at 3:05
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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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  • $\begingroup$ Got the point thank you stack mate $\endgroup$ – Sid Patil Feb 9 '17 at 3:15
  • $\begingroup$ Good thing I still commented even after you accepted an answer! No problem! $\endgroup$ – K Split X Feb 9 '17 at 4:10
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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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  • $\begingroup$ Is there any logic behind shifting points $\endgroup$ – Sid Patil Feb 9 '17 at 3:11
  • $\begingroup$ Where should the decimal be placed? What if both numbers are decimals? Please clarify your answer, thanks! $\endgroup$ – shardulc Feb 9 '17 at 3:11
  • $\begingroup$ I mean what if two ✌ decimals and do a division ➗ $\endgroup$ – Sid Patil Feb 9 '17 at 3:12
  • $\begingroup$ @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. $\endgroup$ – Timothy Cho Feb 11 '17 at 0:14

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