dont know about associative property but this one is easy in your head. 4x25=100x27=2700
No.
Your brain, of course.
It depends on your computational skills.
The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).
dont know about associative property but this one is easy in your head. 4x25=100x27=2700
No.
benchmark numbers
Your brain, of course.
It depends on your computational skills.
(4X25) x 27
The term that describes numbers that are easy to compute mentally is "round numbers." Round numbers are whole numbers that end in zero or five, making them simpler to work with in mental calculations. These numbers are often used in estimation and quick arithmetic tasks due to their ease of manipulation.
The patterns and properties to compute mentally 120 times 30 is the numbers 12 and 3 plus the two 0. Multiply 12 by 3 (36) and add the two 0 (3600).
There are many ways to do it. Have a look at the Wikipedia article (check the link).
Break it up into two separate problems. First 4X25=100, which is easy enough. Then 27X100=2700.
Numbers like 10, 25, 50, and 100 are easy to compute mentally because they have simple multiples or divisions that are easy to work with. For example, doubling 25 is 50, or dividing 100 by 10 gives you 10. These numbers are often used as benchmarks in mental math calculations.
Do the 2 x 50 first. Get 100. Multiply that by 14.