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Q: How do you compute 4x25x27 mentally?

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the property which states that for all real numbers a,b,and c their product is always the same, regardless of their grouping

No.

4*25 = 100 So 4*25*27 = (4*25)*27 = 100*27 = 2700

Compatible number

benchmark numbers

It depends on your computational skills.

Your brain, of course.

if you mean multiplication then 4x25=100 x 27 = 270

compatible numbers

Compatible Numbers numbers that are easy to compute mentally are called

There are many ways to do it. Have a look at the Wikipedia article (check the link).

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).

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