Compatible number
there are no perfect numbers instead there are perfect cubes, perfect squares, natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers. If you want natural no. they are 21, 22, 23, 24, 25, 26, 27, 28, and 29.
No, the ratio of two natural numbers can be positive, negative, or zero depending on the numbers being divided.
Any numbers that can be written as the product of some number with itself e.g.: 1 = 1*1 4 = 2*2 9 = 3*3 16 = 4*4 100 = 10 * 10 There are an infinite number of square numbers so you can't expect a comprehensive list.
how to easy in tally
Related facts that use the same numbers are called a fact family. A fact family includes both addition and subtraction facts using the same set of numbers.
benchmark numbers
It depends on your computational skills.
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.
No.
Compatible Numbers numbers that are easy to compute mentally are called
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.
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.
Rational?