A Christmas Maths Starter Of The Day









? + ? = 712g

? + ? = 857g

? + ? = 767g

? - ? = 90g

? - ? = 28g

? - ? = 55g

? + ? = 885g

? + ? = 795g

? - ? = 83g

? - ? = 173g

Replace the question marks with the weights of the puddings.

Topics: Starter | Arithmetic | Xmas

You can find many more ChristMaths activities at:



  • Clive, Southampton
  • There is an old saying: 'work smarter… not harder’. Most of the pudding pairs required to complete the calculations above can be found by considering the ones (units) digit only. You can very quickly eliminate pairs of puddings that can't possibly be candidates for inclusion by only considering the last digits of their weights.
  • St Serf’s Primary School In Tullibody, Twitter

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a. 401 + 311 = 712g

b. 401 + 456 = 857g

c. 456 + 311 = 767g

d. 401 - 311 = 90g

e. 484 - 456 = 28g

f. 456 - 401 = 55g

g. 484 + 401 = 885g

h. 484 + 311 = 795g

i. 484 - 401 = 83g

j. 484 - 311 = 173g

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.

There is a printable worksheet to go with this activity.


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Laptops In Lessons

Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:


However it would be better to assign one of the student interactive activities below.

Laptops In Lessons

Here is the URL which will take them to another Christmas activity.


Student Activity



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