# C002 Compensation Laws

## Work to memorise

Compensative Law If you round off a number by adding or subtracting a number and then compensate by adding or subtracting the opposite of that number without changing the result, the sum has compensative properties.  Example:    367 + 154 ﻿ ﻿= 367 + 3 + 154 - 3 (round the first number off to nearest 100 and compensate by subtracting 3 to the second number). ﻿ ﻿=  370 + 151 ﻿ ﻿=  521 Example (careful with subtraction):     356 – 247           = 356 + 3 - 247 - 3 (round the second number off to nearest 100 and compensate by adding 3 to the first number).           = 359 - 250           = 109   Addition and subtraction are both compensative

## Do activity

B2B Algebra A01 General introduction C002 Compensation Laws

## The compensative law apply to:

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## The idea is to round off numbers to numbers that are easier to work with

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## How can I deal with the following

546-129 I decide I would like to round the -129 off to -130 How do I do that?

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