Kungfu math p4 slide8 (addition fraction)pdf
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Transcript of Kungfu math p4 slide8 (addition fraction)pdf
• addition of ∗ like fractions
∗ related fractions
• (Denominators of given fractions should not exceed 12)
What will we learn today?
Fraction Addition
In the previous lectures, we have learnt about
Mixed Numbers and
Improper Fractions
Let’s recap!
Naming the parts
2 1 5
Whole number
Numerator
Denominator
Three Types of Fractions
There are three types of fraction:
1⅞ ⅞ ⅞ 1
proper fraction improper fraction mixed fraction
Mixed Fractions or Improper Fractions
You can use either an improper fraction or a mixed fraction to show the same amount.
1⅞ = 15
8
Applying what we have learnt
3 simple steps to add fractions:
• Step 1 – Make sure the bottom numbers
(denominators) are the same
• Step 2 – Add the top numbers (numerators), put the
answer over the denominator.
• Step 3 – Simplify the fraction (if necessary).
For example
Simplify the fraction (if necessary).
Add the top numbers (numerators), put the answer over the denominator.
Try this out!
1. Find the value of . 29
7 + 2
7
Solution
1. Find the value of . 29
7 + 2
7
29
7 + 2
7 =
Step 1 Make sure the bottom numbers (denominators) are the same
Solution
1. Find the value of . 29
7 + 2
7
29
7 + 2
7
29+2
7 =
31
7 =
Step 2 Add the top numbers (numerators), put the answer over the denominator.
Solution
1. Find the value of . 29
7 + 2
7
29
7 + 2
7
29+2
7 =
31
7 = Step 3
Simplify the fraction (if necessary).
= 3
7 4
Applying what we have learnt
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
camera
radio
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
camera
radio
sold This is 1 out of 5 parts
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
camera
radio
sold
There are 4 units within.
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radio left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
The shop has an equal number of cameras and radios left. There are also 4 units within.
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Count the number of the units which have the same size. There are 9 units which are of the same size.
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Step 1: 212 – 68 = 144
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Step 1: 212 – 68 = 144 Step 2: 212 ÷ 9 = 16
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Step 1: 212 – 68 = 144 Step 2: 212 ÷ 9 = 16
Each small unit represent 16 items
Try this out!
2. A shop has a total of 212 cameras and radios. After selling of the cameras and 68 radios, the shop had an equal number of cameras and radios left. How many cameras were left in the shop?
1
5
camera
radio
sold
68 radios
212
Step 1: 212 – 68 = 144 Step 2: 212 ÷ 9 = 16 Step 3: 16 x 4 = 64
Each small unit represent 16 items
?
Summary
• Step 1 – Make sure the bottom numbers
(denominators) are the same
• Step 2 – Add the top numbers (numerators), put the
answer over the denominator.
• Step 3 – Simplify the fraction (if necessary).
Are you ready to try out the questions?
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