Guitar - Starting with Chords

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Numbers - Week 36 - Lesson 3 - Adding and Subtracting Decimals (NP)

Objective: to learn how to add and subtract decimals

Lesson:

What numbers would you add to the following numbers to make 10?

o   5,5

o   3,7

o   8,6

o   4,2

·      What decimal can be added with each of these to make 1?

o   0,41

o   0,91

o   0,35

o   0,82

What method could you use to solve these questions?

1.     1,7 + 1,577 =

2.     31,745 – 1, 75 =

The column method is used for solving any addition or subtraction questions, placing the numbers in the same units above each other. 

Example

In a science lesson, a pupil adds 0.45 kg of water and 0.72 kg of salt to a beaker that weighs 0.09 kg. He then pours out 0.6 kg of the mixture, followed by another 0.14 kg. What is the total mass of the beaker and mixture remaining?

Set out the calculation: 0,45 + 0,72 + 0,09 - 0, 6 - 0,14

First do all the additions together (remember to regroup if needed):

   0.45

   0.72

+ 0.09

   1.26

 Then do the subtractions one at a time (remember to borrow if needed):

   1.26                 0.66

 - 0.6                 - 0.14

   0.66                  0.52

 So the final answer is 0.52 kg or 520 grams

Practice:

 Textbook: Pg. 147-148

Numbers - Week 36 - Lesson 3 - Adding and Subtracting Decimals (NP)

Objective: to learn how to add and subtract decimals

Lesson:

What numbers would you add to the following numbers to make 10?

o   5,5

o   3,7

o   8,6

o   4,2

·      What decimal can be added with each of these to make 1?

o   0,41

o   0,91

o   0,35

o   0,82

What method could you use to solve these questions?

1.     1,7 + 1,577 =

2.     31,745 – 1, 75 =

The column method is used for solving any addition or subtraction questions, placing the numbers in the same units above each other. 

Example

In a science lesson, a pupil adds 0.45 kg of water and 0.72 kg of salt to a beaker that weighs 0.09 kg. He then pours out 0.6 kg of the mixture, followed by another 0.14 kg. What is the total mass of the beaker and mixture remaining?

Set out the calculation: 0,45 + 0,72 + 0,09 - 0, 6 - 0,14

First do all the additions together (remember to regroup if needed):

   0.45

   0.72

+ 0.09

   1.26

 Then do the subtractions one at a time (remember to borrow if needed):

   1.26                 0.66

 - 0.6                 - 0.14

   0.66                  0.52

 So the final answer is 0.52 kg or 520 grams

Practice:

 Textbook: Pg. 147-148

Numbers - Week 36 - Lesson 3 - Adding and Subtracting Decimals (NP)

Objective: to learn how to add and subtract decimals

Lesson:

What numbers would you add to the following numbers to make 10?

o   5,5

o   3,7

o   8,6

o   4,2

·      What decimal can be added with each of these to make 1?

o   0,41

o   0,91

o   0,35

o   0,82

What method could you use to solve these questions?

1.     1,7 + 1,577 =

2.     31,745 – 1, 75 =

The column method is used for solving any addition or subtraction questions, placing the numbers in the same units above each other. 

Example

In a science lesson, a pupil adds 0.45 kg of water and 0.72 kg of salt to a beaker that weighs 0.09 kg. He then pours out 0.6 kg of the mixture, followed by another 0.14 kg. What is the total mass of the beaker and mixture remaining?

Set out the calculation: 0,45 + 0,72 + 0,09 - 0, 6 - 0,14

First do all the additions together (remember to regroup if needed):

   0.45

   0.72

+ 0.09

   1.26

 Then do the subtractions one at a time (remember to borrow if needed):

   1.26                 0.66

 - 0.6                 - 0.14

   0.66                  0.52

 So the final answer is 0.52 kg or 520 grams

Practice:

 Textbook: Pg. 147-148