Stop using a calculator for solving complex mathematics questions. Now you may be wondering how to add and multiply in your head? Well, it's not that difficult as you know that numerous shortcut tricks are applied to solve complex numerical. Occasionally, you might find it tricky to use it in your head. However, if you try to split the numbers smartly, the calculation can become simpler. Let us check some of the tricks on using the methods in your head.
Suppose you went to a shop to buy 7 packets of sweets. Let the price of each packet be 97. How much do 7 packets cost you?
Solution:
( Avoid using calculator, calculate in your head following the simple trick)
At first, find the close numbers that end with zero. Like 97 is almost 100. So multiply 7 with 100 results 700. Now the difference between 97 and 100 is 3. Multiply 7 and 3 to get 21. Therefore, 700-21= 679. As simple as that.
Follow the steps for better understanding.
97 can mathematically say as (100-3). Now you can calculate under the impression as:
7* (100-3) or,
(7*100)- (7*3)
Now, separately multiply the two numbers then subtract the resulting number.
7*100= 700
7*3= 21
700-21 or, 700-20-1= 679.
Don't you find it easy? Don't worry once you get into the habit of using the tricks to solve all the questions. It will be easy for you to solve it within seconds without using pen paper. Do the numbers mesmerise you? If it is so. Then participate in class 7 Mental Ability Olympiad examination to speed up your calculation and impress the world with your tangible talent. Before beginning your learning, check the sample questions asked in the tests. Let us review some of the questions for your clear awareness.
Interchange the signs from the following equation to make it true.
51÷3×12-6+3=11
+, ÷
÷, -
×, +
+, -
Complete the AZ, GT, MN,?, YN series.
RX
SH
KV
YD
