22 Jun 2022 22 Jun 2022 Created by Mr. Lafferty Maths Dept. Created by Mr. Lafferty Maths Dept. Working with Decimals Decimal Scales Decimal Numbers Decimal Numbers www.mathsrevision.com Multiplying and Dividing by 10, 100, 10 Multiplying and Dividing by a single Digi Rounding to 1 Decimal Place Addition and Subtraction MNU 2-03b MNU 2-04a
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11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.
Working with Decimals
Decimal Scales
Decimal Decimal NumbersNumbers
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Multiplying and Dividing by 10, 100, 1000
Multiplying and Dividing by a single Digit
Rounding to 1 Decimal Place
Addition and Subtraction
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.
Starter QuestionsStarter Questionsw
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1. Find the missing value
2. Calculate of 6000
3. What is the next three numbers in the sequence 9, 15, 21, 27, ...., ...., .... 4. Round 72 to the nearest 10
3 ?=4 20
20%
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
1.1. Understand what a decimal Understand what a decimal number is.number is.
1. We are learning what a decimal number is. Write down the decimal number represented by a fraction diagram.
Decimal Decimal NumbersNumbers
2.2. Write down the decimal Write down the decimal number represented by a number represented by a fraction diagram.fraction diagram.
Writing DecimalsMNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
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Decimal Decimal NumbersNumbers
When you take a When you take a single unitsingle unit and divide it and divide it into 10 bitsinto 10 bits, , what we then have are what we then have are
decimal fractionsdecimal fractions of a whole number of a whole number
Writing Decimals
Imagine, 1 bar of chocolate as our UNIT of measure.
1 (of 1 bar)
10
or 0.1
1
0.110 1. 0
0.1 0.40.2 0.3 0.5
0.6 0.90.7 0.8 1.0
means ten
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
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Decimal Decimal NumbersNumbers
Writing Decimals
Example : Write down the decimal number represented by the shaded area.
(a)
(b)
0.3
3 "which means 3 tenths = "
10
0.5
5 1 "which means 5 tenths = = "
10 2
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
w.m
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srevis
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Decimal Decimal NumbersNumbers
Writing Decimals
Example : Write down the decimal number represented by the diagram.
(a) (b)
(c) (d)
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
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Decimal Decimal NumbersNumbers
We can take one bit of the chocolate bar We can take one bit of the chocolate bar and split it into 10and split it into 10
Writing Decimals
0.10.01
1st Decimal place
2nd Decimal place
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww
w.m
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srevis
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.com
Decimal Decimal NumbersNumbers
Writing Decimals
Example : Write down the decimal number represented by the diagram.
(a) (b)
(c) (d)
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.
Now try Exercise 1
Ch2 (page 25)
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Decimal Decimal NumbersNumbers
Writing DecimalsMNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.
Starter QuestionsStarter Questionsw
ww
.math
srevis
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.com 1. Find the perimeter of the shape
2. Calculate 30% of 900
3. Find the area of the rectangle
6cm in length by 4 cm wide.
4. Name the shape.
3cm
MNU 2-03b MNU 2-04a
11 Apr 202311 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.ww