Adding and Subtracting Decimals

We usually add numbers when we have different and varied data, but when we are given with a set of repeated data, we multiply.

Multiplication is a much easier way to calculate repeated data.

2 × 3 also means 2 + 2 + 2 which is equal to 6.

Example: Let’s say Jim buys 4 pens costing $3.50 each. What is the total cost?

Cost of one pen = $3.50

Hence, the cost of 4 pens

= $3.50 × 4 (Which is same as 3.50 + 3.50 + 3.50 + 3.50)

= $14.00

Importance of Place Value While Adding and Subtracting Decimals

Let’s look at this with a couple of examples

Example 1

2.87 + 3.02 + 0.006 + 123.9 + 4

Example 2

Renée bought 6.75 pounds of apples, 4.5 pounds of oranges, 3.82 pounds of bananas, and 2.25 pounds of grapes. How much fruit did she buy in all?

Solution

Fruits Renée bought in all = 6.75 + 4.5 + 3.82 + 2.25 = 17.32 pounds

Subtracting Decimals

Subtracting decimals is very similar to the way we have learned above in adding decimals.

Let’s see how.

Example

Daniel has 2 pieces of wood measuring, 10.34 inches and 7.56 inches. How much longer is the first piece than the second one?

Subtract the lengths of 2 given wooden pieces.

10.34 – 7.56

= 2.78

So, the first piece is 2.78 inches longer than the second wooden piece.                                                

Check Point

Add the following decimals

1. 3.25 + 1.32 + 4.67

2. 1.46 + 2.35 + 1.00

Subtract the following decimals

3. 5.82 – 1.23

4. Richard has 100.56 pounds of grain out of which he 34.156 pounds to his brother, John. How many pounds of grain is Richard left with?

5. A box of peanut butter cookies costs $3.40 and a box of oatmeal cookies costs $4.25. What is the total cost for both cookie boxes?

6. Mary has 20.752 inches of ribbon out of which she used 12.456 inches of ribbon for decorating purposes. How much ribbon is she left with?                                            

Grade 6 Science Worksheets

• Inquiry process
• Nature of Science
• Scientific Inquiry
• Inquiry, Analysis and Problem Solving
• Ethical Practices
• Science and Society
• Biotic and Abiotic Factors
• Impact of Organisms
• Adaptation
• Spheres of Earth
• Natural Resources
• Environmental Issues
• Conservation of Earth
• Understanding Technology
• Abilities To Do Technological Design
• Structure of Earth
• Solar System
• Rocks and Fossils
• Earth Systems
• Plate Tectonics
• Evolution
• Magnetic Field of Earth
• Geologic Time
• Materials and Processes That Shape a Planet
• Astronomy
• Ecology
• Energy
• Kinetic and Potential Energy
• Energy Transfer
• Matter and its Structure
• States of Matter
• Physical and Chemical Changes
• Force and Motion
• Electricity and Magnetism
• Wave Interactions
• Sound
• Light
• Introduction to Life Science
• The Origin & History of Life On Earth
• Plant and Animal Cells
• Parts of a Cell
• The Cell Cycle
• How Living Organisms Get Energy
• Classification of Organisms
• How Plants Grow & Reproduce
• The Human Respiratory System
• The Human Cardiovascular System
• The Human Digestive System
• The Human Endocrine Systems
• The Human Nervous System
• The Human Muscular System
• The Human Skeletal System

Grade 6 Math Worksheets

• Probability
• Ratio
• Sequence & Patterns
• Division Word Problems  (New)
• Solving two step equations (New)
• One Step Equation  (New)
• Place Value  (New)
• Two Step Equation  (New)
• To convert percents to decimals and vice versa  (New)
• To convert Percents to Fractions and vice versa  (New)