Maths Elly cooney

The rule for rounding

If the digit in the place value after the required accuracy is a 5 or more, then round up. If it is 4 or less round down.


  • 26=30
  • 107=100
  • 261=300
  • 1159=2000
  • 0.5, 1/2, 50%

Irrational number

An irrational number is a number that can not be written as a simple fraction.

Example- Pi is an irrational number

Rational number

A rational number can be written as a ratio of two integers

Example- 1.5 is rational because it can be written as the ratio 3/2

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