It depends on your computational skills.
help
compatible numbers
No.
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.
benchmark numbers
Compatible number
Compatible Numbers numbers that are easy to compute mentally are called
compatible numbers
No.
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.
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).
Break it up into two separate problems. First 4X25=100, which is easy enough. Then 27X100=2700.