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Thank you to everybody who sent us their thoughts about this challenge. William from Dronfield Junior School in England sent in these solutions, splitting the total number of dots into tens and ones:
Finley from Goodrich C E Primary School in the UK also used tens and ones to represent the number:
Polly from Gorse Ride Junior School in England sent in these number sentences to represent the dots:
20+3=23
10+10+3=23
15+5+3=23
10+5+8=23
5+5+10+3=23
Polly has used the same idea of splitting the total number into tens and ones, but has also found solutions where the number 5 is important. I wonder why the number 5 might stand out when someone looks at the dot picture?
If anybody has any different ideas about how to represent this number, please email us.