Subtraction
History of Marcelo Guedes - Roraima, Brasil
Subtraction. Properties
39 - 28 = 11 (It reads: The difference between thirty-nine and twenty-eight is equal to eleven.)
39 (Additive), 28(Subtractive) and 11(Difference)
Note: To check whether the subtraction is carried out correctly, the fundamental property of subtraction can be applied:
The sum of the subtractive and the difference is equal to the additive.
To make an estimate of a difference, we normally round the numbers to the nearest tens or hundreds.
903 + 288 = 615 (Exact value)
900 - 300 = 600 (Estimate)
39 - 28 = 11 (It reads: The difference between thirty-nine and twenty-eight is equal to eleven.)
39 (Additive), 28(Subtractive) and 11(Difference)
Note: To check whether the subtraction is carried out correctly, the fundamental property of subtraction can be applied:
The sum of the subtractive and the difference is equal to the additive.
To make an estimate of a difference, we normally round the numbers to the nearest tens or hundreds.
903 + 288 = 615 (Exact value)
900 - 300 = 600 (Estimate)
