G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

 

Year 7 Interactive Maths - Second Edition


Subtraction of Decimals

To subtract a small decimal number from a larger decimal number, write them down with the larger one on top and the decimal points underneath one another.  Then calculate the subtraction as you would for whole numbers and line up the decimal point in the answer.


Example 8

Rewrite 3.67 – 1.83 in columns; and then calculate.

Solution:

Decomposition method or equals addition method


Example 9

Rewrite 83.47 – 57.684 in columns; and then calculate.

Solution:

Decomposition method or equals addition method


Note:

To add (or subtract) decimals, always fill empty place values with zeros so that all of the numbers have the same number of decimal places.


Example 10

Rewrite 24 – 8.327 in columns; and then calculate.

Solution:

Decomposition method or equals addition method


Note:

24 = 24.000

 

Study Another Topic in Chapter 6: Decimals

Decimals ] Representation of Decimals on a Number Line ] Comparing Decimals ] Addition of Decimals ] [ Subtraction of Decimals ] Multiplication of Decimals ] Multiplication of a Decimal by a Power of Ten ] Multiplication of a Decimal by a Multiple of a Power of Ten ] Multiplication of a Decimal Number by another Decimal Number ] Division of a Decimal by a Whole Number ] Division of a Decimal by a Power of a Ten ] Division of a Decimal by a Multiple of a Power of Ten ] Division of a Decimal by another Decimal ] Rounding Off ] Recurring Decimals ] Problem Solving Unit ] Symbols ] Index ]

 

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