Reverse Percentages Explained: Finding the Original Value (Teach This Topic)
This guide supports teaching reverse percentages: finding an original value when the final value and percentage change are known. Open Full Article...
proportional reasoning
Reverse Percentages Explained: Finding the Original Value
If a jumper costs £80 after a 20% discount, why is the original price not £100 simply because we add 20% back? Open Full Article...
Percentage Increase and Decrease: Understanding How Values Change (Parent Q&A)
This guide explains the lesson’s key ideas about percentage increase and decrease. Open Full Article...
Percentage Increase and Decrease: Understanding How Values Change (Teach This Topic)
This guide supports teaching percentage increase and decrease at home, from the meaning of a reference value to multipliers, successive change and… Open Full Article...
Percentage Increase and Decrease: Understanding How Values Change
Why does a 10% rise in a £50 price not add £10? The answer depends on the value used as the reference whole. Open Full Article...
Fractions Inside Reverse Calculations: Finding the Original Amount (Parent Q&A)
This guide explains how to recover an original amount when a fraction or percentage of it is known. Open Full Article...
Fractions Inside Reverse Calculations: Finding the Original Amount (Teach This Topic)
This guide supports teaching learners aged 11 to 16 how to recover an original amount from a known fraction, percentage or multiplier. Open Full Article...
Fractions Inside Reverse Calculations: Finding the Original Amount
If 1/4 of a number is 6, how can we work backwards to discover the whole number? Open Full Article...