Q: What are the patterns and properties to compute mentally for 120 times 30?

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No, but if you practice you can learn to do it and it gets easier. Start of by learning (by rote) your times tables and when adding up do so in 10s.

It depends on the shape you are attempting to compute the volume of. If you are attempting to compute the volume of a box (eight sides, each perpendicular), then it is simply length times width times height.

Times the diametre by pi

There is no such word since the ease of division depends on how well you know your times tables, how well you know your divisibility rules as well as how good you are at recognising patterns.

Divide it by 100 and then times it by itself

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No, but if you practice you can learn to do it and it gets easier. Start of by learning (by rote) your times tables and when adding up do so in 10s.

It depends on the shape you are attempting to compute the volume of. If you are attempting to compute the volume of a box (eight sides, each perpendicular), then it is simply length times width times height.

Times the diametre by pi

There is no such word since the ease of division depends on how well you know your times tables, how well you know your divisibility rules as well as how good you are at recognising patterns.

Divide it by 100 and then times it by itself

Percentage mark up.

It is possible to compute numbers larger than can be written using normal mathematics. There is an algorithm that is used to compute the decimal expansion of pi. It is easy to compute the sum of all the counting numbers from one to 100. Add the highest and lowest, and you will get 101. Add the next highest, 99, and the next lowest, two, and you will again get 101. If you continue in this way to compute the sums, you will have the sum 101, computed 50 times. Now compute the product of 50 and 101, and you will get 5050. This is the sum of all the counting numbers from one to 100.

Ooop

21.388888888888885 and i din't use a calculato i did it mentally

20, to the nearest ten.

The are important because if the occur a number of times scientist can use the patterns to predict things

It means: 1/10 times 3.7 = 0.37