A Lesson Guide On - Subtraction of Decimal Numbers

in #education-hive4 years ago

Subject: Mathematics
Topic: Addition of Decimal Numbers
Date: May 5, 2020

Presentation:

Previous Lesson:
In our last lesson, I talked about addition of numbers which is the bringing together of items or objects. It is denoted by a plus sign “+”, then moved on to show steps you can use to solve problems on decimal numbers. I want to believe u took your time to solve them. Please do not leave any question unanswered. It is easy as I said. Right!, let’s move on.

Today’s Lesson
Today we will be learning how to subtract decimal numbers. Do not worry. As I said earlier, it is every easy to do. Just follow the steps. It is just like your normal Subtraction with whole numbers. The only thing to observe is the arrangement of the decimal places just as what we did during the addition process in our previous class.

Aim and Objectives:
At end of this lesson, the student will be able to:

  • understand the meaning of subtraction.
  • carryout subtraction with decimal numbers.

Step 1
What is Subtraction
Subtraction is the removal of item(s) or object(s) from another group of objects. The object here are represented in numbers. This act is denoted by a minus sign ( - ).

I know you would love to know how to differentiate question that has to do with addition and subtraction. In subtraction, “from” is use to show that u are to remove something From another thing. But in addition, u will be asked to add everything together.

let us see the example below.

Example:

Please permit me to use you for an illustration.

Your mother gave you 5 mangoes and your kid sister asked you to give her 2 of your 5 mangoes and you did. After giving it to her, when u count the number of mangoes in your hand, u will discover that you are left with 3 mangoes. That is what subtraction means. It means that the total number of mangoes u had has been reduced by 2.

To represent the scenario mathematically, it is thus:
5 – 2 = 3

Step 2
Subtraction of Decimal Numbers
the arrangement is the same as that of the addition, but the act of deriving an answers is the difference. In subtraction, you only remove objects a certain number of objects from the group.

Note: when working out subtraction with decimal, be sure that you align the digits having the same place value in the same column.
Example:

image.png

That is how to arrange the numbers base on their place values.
Now let us do the subtraction.

Example
Subtract 23.235 from 56.7
After the arrangement, you can easily subtract to have your answer.

image.png

Exercises

  1. Subtract 23.56 from 89.88
  2. Subtract 2.456, 3.234 and 8.32
  3. Subtract 333.567 form 490.34
  4. Subtract 345.89 from 855.89

I hope to see you next time with answers to the above questions. Stay safe.