I love this video it really clarifies the 'borrowing' a ten aspect. Go from 2:05 for exemplar question 135-27.
Algorithms are cool but when you have a Gloss test if this is your only strategy then your mental maths is very limited. So branch out and learn other mental strategies as well. Come and ask me if you don't know any othermethodss to solve this question and I'll show you at least two others in only 1 minute.
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