GCSE Maths from Scratch 2.05a Introducing Estimation

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This is amazing exactly what I needed to get back into maths as an adult, you sir are a saint

ambershaw
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Hi Jack, I'm stumped on this one. approximate 42.1+78.6 divide by 4.7-19.3 I get -8.5 The answer is 32 according to the book? Any suggestions? Thanks

nidgeontour