Can you make this statement true by adding just one small line?

Topics: Starter | Puzzles

• Carol Lowry, Sheffield Park Academy
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• Make this sum correct by adding one straight line

5+5+5=550

Many others similar of course!
• R Rees,
•
• One pupil did 10 10 10 ≠ 9:50 which I thought was excellent.
• Millicent, Martham Primary School
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• This was a big brain teaser it made me work really had but I did it in the end. I think that you should try this one because it really gets you going for the rest of the day!!!
• Paul Trickett, Prt1960@hotmail.com
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• My Puzzle is as follows....
Move one Digit in this sum to make it correct...
103 - 102 = 3
Ans.....
103 - 102 = 3.

Great idea Paul. It has been created as an animation below. Transum
• Prince Of Maths, West Yorkshire
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• Once, there was a prince called Bob. His father said to him:-
I rode into town on Friday, stayed for 3 days, and rode back out on Friday, how did I do it?
• S2 Maths Class Holyrood, Holyrood Secondary
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• Qaisar solved this in two seconds. We all thought this was great!! Mrs Boussouara's S2 maths class rules!!R.O.F.L.
• Rhys, Barclay Primary
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• How do you make this true. 1-1=2 just one line
A. 1+1 =2.
• Emily,
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• 103-2=11
Move one number
A: 13-2=11.
• Kieran, Icknield
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• Can you find the right answer, by moving 1 line?
56-42+72=26
56+42-72=26
what do you think?
• Maths N Laughs, Yate, S Glos
•
The solution to sinx = nx is x = 6, can you work out how?
The answer is to simply divide both sides by n:
si x = x
:)
A little maths joke I hope you agree!
• Rebecca Wathen, Worfield Primary School
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• 0.5 = 1 - 2
Move two items in this number sentence to make it correct.
• Reilly Stallard-Gorton, Worfield
•
• 103 + 104 = 1207
Move 1 number to make this true.
You have to move the 1 from the instructions to the beginning of the calculation!
1103 + 104 = 1207.
• Matthew Zhao, Year 7, Brisbane Boys' College, Toowong, Brisbane
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• I have a maths puzzle:
41+1=25
You are allowed to rub out only 1 part anywhere in the sum.
4!+1=25.
• Ramesh P, APL Global School
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• One of my students in grade IX gave the correct solution.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.

Previous Day | This starter is for 30 May | Next Day

Can you make up a puzzle like this? An equation or identity which is not true but can be made true by adding a line or a point. Your puzzle can be featured on this page. Enter your puzzle here.

## Extension 1: Move One Number

###### 103 − 102 = 3

Can you move just one number to make the statement above correct?

## Extension 2: Move One Item

###### 0.5 = 12

Can you move just one item to make the statement above correct?

## Extension 3: Move One Digit

###### 19 − 11 = 1108

Can you move just one digit to make the statement above correct?

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