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I would solve  (b) as follows ;

10 + 20 + 30 + … + 790 = (800 x 39) + 400 = 31600

or

10 + 20 + 30 + … + 790 = (790 x 39) + 790 = 31600

Ans : 316m.

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You can use any method to find the sum of consecutive numbers from 10cm to 790cm ( in steps of 10 )

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Thank you Acestarling. I wasn’t sure initially if they could use algebra formula to calculate at P5.

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Yes……Algebra is only covered in the early part of P6 level, hence may not be so “appropriate” for P5 question. However, there is not really any algebra involved here in the solution. The N(N+1)/2 is actually a standard “formula” for calculating the sum of consecutive numbers, you may use other alternative method which you are more familiar with.

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