Tricks for Doing faster Multiplication!

These are the best tricks and tips that, if you seriously take time to read these, practice them, and put them to use, you will see better grades, faster completion, and less mistakes. We have categorized them by the course or subject in which they are most useful. These tricks were presented to students by Jairaj Prasad (Administrator), at the last 'Maths Convention', on Saturday.

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Here are the following 2 tricks for 'Multiplication', that will make Mathematics easier for you! Read and Practice them as much as you can, and there is no standard boundary, you can learn them even if you're interested in learning them!

Trick #1: Ignore the trailing zeros 

What this means is that if you have a number such as 250, pretend it is just 25. Once you do the multiplication, you just add the zero back to the end of your answer. This works for any number of zeros. 250000, 250, and 25000000 should all be treated the same as 25. Just remember to add the respective amount of zeros to the end of your answer. However, you cannot simplify a problem when the zeros are in the middle. You can only use this for trailing zeros (zeros at the far right side). For example, 205 must be thought of as 205. This cannot be reduced to anything smaller. On the contrary, 2050 can be treated as 205, because there was one trailing zero. This helps quite a bit. 

Trick #2: Ignore the decimals 

This trick is the exact same as the first one. If you have a decimal, forget about it. Pretend it isn’t there. It only has an affect on your answer, so you can completely ignore it while you’re multiplying. Doing work in your head requires you to simplify things as much as possible, or you can mess up real easily. So, pretend there is no decimal. 2.54 becomes 254, and 12.3 becomes 123. It is as simple as that. Now, how does this affect the answer? You need to count the number of digits that come after the decimal. 12.3 has 1 digit after the decimal, and 2.54 has 2 digits after the decimal. You are multiplying two numbers together, so you add the total. If you were multiplying 12.3 and 2.54, there are 3 total digits that come after the decimal. This should be reflected in your answer. If there is a total of 3 digits after the decimals, you will place the decimal in your answer so there are 3 digits after the decimal! It is as simple as that. For example, if you have a number that is XX.X multiplied by Y.YYY, the answer will be in the form ZZ.ZZZZ.

What do you think about this? Do share them in comments.