Route to Las Vegas

Without a calculator, work out the cheapest route from Los Angeles to Las Vegas:

Los
Angeles
115734834364
5019252834554693
579174299590Las
Vegas

You can move from square to square horizontally or vertically (but not diagonally). Each time you enter a square you have to pay the amount shown.


Topics: Starter | Arithmetic | Puzzles

  • Richard Lewis, Chis & Sid GS
  •  
  • I will be using this tomorrow with a bright Year 7 group. It's a great introduction to real-world logistics problems!
    However it strikes me that increasing the size of the numbers in the grid doesn't actually significantly increase the complexity because it is still relatively easy to spot the smaller and larger value routes on such a small grid.
    Adding another row to the grid would possibly be a better way of raising the difficulty level since there are then more options to evaluate mentally.
  • Callum - Year 6, Charnwood Primary - Lichfield
  •  
  • I found this starter very easy, perhaps more numbers or higher numbers would make it more challenging.
  • Transum,
  •  
  • Thank you Richard, Chris, Sid and Callum for your feedback. Buttons can now be found lower down the page to produce the grids you suggested.
  • Mrs K, Maths Cadets
  •  
  • We got it straight away. If the numbers had been bigger or there had been more squares, it would have been harder.

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.
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Previous Day | This starter is for 20 November | Next Day

 

Answers

There are 10 different five step routes from Los Angeles to Las Vegas.

Los Angeles - 1157 - 3483 - 4364 - 4693 - Las Vegas [Total = 13697]

Los Angeles - 1157 - 3483 - 3455 - 4693 - Las Vegas [Total = 12788]

Los Angeles - 1157 - 3483 - 3455 - 9590 - Las Vegas [Total = 17685]

Los Angeles - 1157 - 2528 - 3455 - 4693 - Las Vegas [Total = 11833]

Los Angeles - 1157 - 2528 - 3455 - 9590 - Las Vegas [Total = 16730]

Los Angeles - 1157 - 2528 - 7429 - 9590 - Las Vegas [Total = 20704]

Los Angeles - 5019 - 2528 - 3455 - 4693 - Las Vegas [Total = 15695]

Los Angeles - 5019 - 2528 - 3455 - 9590 - Las Vegas [Total = 20592]

Los Angeles - 5019 - 2528 - 7429 - 9590 - Las Vegas [Total = 24566]

Los Angeles - 5019 - 5791 - 7429 - 9590 - Las Vegas [Total = 27829]

So the cheapest route costs 11833 (dollars). Here is a way of getting that total:

Los
Angeles
115734834364
5019252834554693
579174299590Las
Vegas

You can view another version of this starter generated from random numbers. Puzzle 1 is the easiest, puzzle 5 is very difficult.

Alternatively you can change the size of the grid to make the problem more complex:

Number of rows: Number of columns:  

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.


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