Math is Rad (Maths is Rad in the UK version) is an educational math book Greg Heffley got for Christmas in The Last Straw.
One of his aunts gave it to Greg and told him that it would help get him started on Algebra. Greg uses this as an example of adults giving you books and clothes instead of fun toys as you grow up and expecting you to be happy about it.[1]
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- ↑ The Last Straw, page 9