My son’s answer. He said he thought about the single digit squares and they are 1, 3 and 9. He knew it couldn’t be zero or two because there aren’t zero- or two-sided shapes. So he checked 72 is in the 8s times table. Clearly he didn’t need the factors bit, I wonder if this is intended as part of the knowledge needed for that question, but it did reassure him his answer was correct. #tmwyk
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