Four Make 999

A Maths Starter of The Day

Choose any four numbers from the grid and add them up.

360 209 370 163
422 478 432 474
366 314 153 356
412 177 271 205

Find as many ways as possible of making 999.
You may use a calculator if you wish.

 

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Keywords: Starter | Arithmetic

"More Solutions from Whitby Technology College:

235 + 280 + 212 + 272 = 999
280 + 280 + 227 + 212 = 999
272 + 272 + 227 + 228 = 999"

Rebecca Laura Holly Amy Georgia Tyler & Kieran, Whitby High, Ellesmere Port
Wednesday, May 16, 2007

 

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This starter has scored a mean of 3.9 out of 5 based on 17 votes.
 

  

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Answers

We found:

209 + 153 + 271 + 366 = 999
209 + 153 + 205 + 432 = 999
209 + 205 + 271 + 314 = 999
370 + 205 + 153 + 271 = 999
474 + 209 + 153 + 163 = 999
356 + 209 + 163 + 271 = 999
412 + 163 + 153 + 271 = 999
422 + 209 + 205 + 163 = 999
478 + 153 + 205 + 163 = 999
360 + 271 + 205 + 163 = 999

Did you find any more?
Did you develop any strategies for choosing numbers which might add up to 999 or did you just type numbers into your calculator randomly?

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.

Try "Three Make 1000". It's a little easier!