fish shop maths
DESCRIPTION
Fish Shop Maths. To understand and use the correct order of operations. A man walks into a Chip shop …. Rita owns a fish & chip shop. Write down the exact portions of food each customer orders Eg 3 fish, 4 chips, 1 sausage. John. Three fish and four chips, ta!. Freddie. - PowerPoint PPT PresentationTRANSCRIPT
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To understand and use the correct order of operations
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A MAN WALKS INTO A CHIP SHOP …
Rita owns a fish & chip shop. Write down the exact portions of food each
customer orders Eg 3 fish, 4 chips, 1 sausage
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JOHN
Three fish and four chips, ta!
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FREDDIE
Sausage and chips twice,
please!
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BRIAN
Five fish and chips. Thanks!
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SO WHAT DID RITA HAVE TO SERVE UP?
John
Three fish and four chips, ta!
3 fish4 portions of
chips
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SO WHAT DID RITA HAVE TO SERVE UP?
Freddie
Sausage and chips
twice, please!
1 sausage2 portions of
chips
2 sausages2 portions of
chips
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SO WHAT DID RITA HAVE TO SERVE UP?
Brian
Five fish and chips.
Thanks
5 fish5 portions of
chips
5 fish1 portion of
chips
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CONFUSED?
Why were there two possible answers to some of the orders?
In a maths lesson, can there ever be two possible answers to a simple calculation?
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TRY THIS:
Compare your answers with a partner
2 × 3 + 5 1 + 3 × 5
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THE SOLUTION
All mathematicians in the world have agreed a set order to work out these calculations:
Brackets
Indices (Powers)
Multiply Divide
SubtractAdd
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EXAMPLE
What is 5 × (6 + 4) ÷ 2? What do we need to use?
5 × (6 + 4) ÷ 2 5 × 10 ÷ 2 5 × 5 25
Did you do 50 ÷ 2? Did you get the same
answer?
Brackets
Indices (Powers)
Multiply Divide
SubtractAdd
Remember: No swapping where the numbers go
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QUESTIONS
A. 5 × (2 + 1) B. 5 × 2 + 1C. 12 + 4 ÷ 2D. (12 + 4) ÷ 2E. 3 × 10 ÷ 5F. 10 ÷ 5 × 3G. 3 × 6 ÷ 2 - 1H. 3 × 6 ÷ (2 -
1)
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ANSWERS (CLICK TO REVEAL)
A. 5 × (2 + 1) B. 5 × 2 + 1C. 15 – 4 × 3D. 12 + 4 ÷ 2E. (12 + 4) ÷ 2F. 3 × 10 ÷ 5G. 10 ÷ 5 × 3H. 3 × 6 ÷ 2 - 1I. 3 × 6 ÷ (2 -
1)
A. 15B. 11C. 3D. 14E. 8F. 6G. 6H. 8I. 18