Four Make 999

A Maths Starter of The Day

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

374 194 427 399
277 230 166 457
304 224 316 346
415 332 362 182

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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Answers

We found:

182 + 277 + 166 + 374 = 999
182 + 277 + 194 + 346 = 999
182 + 194 + 166 + 457 = 999
362 + 194 + 277 + 166 = 999
316 + 182 + 277 + 224 = 999
427 + 182 + 224 + 166 = 999
332 + 224 + 277 + 166 = 999
399 + 182 + 194 + 224 = 999
304 + 277 + 194 + 224 = 999
415 + 166 + 194 + 224 = 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!