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# What are compatible numbers?

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Compatible numbers are simple or simply added numbers with close values to more difficult numbers, substituted in their place for ease of calculation. An example would be substituting 15 and 3 when trying to multiply 14.8 and 2.6.

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Numbers are considered simpler when they are round, whole or even. This means quicker processing and more effective mental math. When using compatible numbers, North Star Math recommends finding whole or simple numbers with the least deviation from the original number. Finally, while they are a useful measure in situations where more exact sums are not possible, using compatible numbers reduces precision.

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## Related Questions

• A:

Rational numbers are numbers that can be expressed as the ratio of two integers, whereas irrational numbers cannot be expressed as a ratio of integers. Irrational numbers expressed as decimals generate an unending series of numbers after the decimal point that never falls into a repeating pattern.

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• A:

The prime numbers less than 100 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97. A prime number is any number that is only divisible by itself and 1. The number 1 is not considered a prime number.

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The numbers up to 100 that are perfect squares are 1, 4, 9, 16, 25, 36, 49, 64, 81 and 100. A perfect square is a number that is the result of a smaller number multiplied by itself.