Author note — to cover

Cover classifying percentage problems before solving: does the question state the original (multiply) or the changed amount (divide)? Mixed forward and reverse sets, increase and decrease, and language cues like 'after the rise' or 'was'. No new arithmetic; techniques come from the multiplier and reverse sibling pages. Both tiers. (R9)

Introduction

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Practice and continue

Practice

Spotting a reverse problem

Deciding whether a question states the original amount or the changed one.

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Simple interest

Interest paid on the starting amount only, so the same sum is added every year.