compatible numbers
compatible number
It depends on your computational skills.
Your brain, of course.
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.
Compatible numbers can easily be divided mentally.
Break it up into two separate problems. First 4X25=100, which is easy enough. Then 27X100=2700.
benchmark numbers
Compatible number
Compatible Numbers numbers that are easy to compute mentally are called
It depends on your computational skills.
Your brain, of course.
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.
easy to divide mentally
Compatible numbers can easily be divided mentally.
Compatible numbers can easily be divided mentally.
Break it up into two separate problems. First 4X25=100, which is easy enough. Then 27X100=2700.
Rational?
dont know about associative property but this one is easy in your head. 4x25=100x27=2700