This exam tips covers Common Mistakes to Avoid within FDP Conversions for GCSE Mathematics. Revise FDP Conversions in Number for GCSE Mathematics with 12 exam-style questions and 22 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 13 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Common Mistakes to Avoid
❌ Wrong: 0.5 = 5%
✅ Right: 0.5 = 50%
Remember to ×100 when converting to %
❌ Wrong: 25% = 0.25/100
✅ Right: 25% = 25/100 = 0.25
% already means /100, don't divide again
❌ Wrong: 0.33 = 1/3
✅ Right: 0.333... = 1/3
1/3 is recurring, not terminating
Practice questions for FDP Conversions
Which decimal is equal to 3/4?
Explain why 1/3 cannot be written as an exact decimal, and write 1/3 using correct notation for recurring decimals.
Quick recall flashcards
FDP Triangle
F (top)
D (left) ← → P (right)
F→D: divide
F→P: ×100
D→P: ×100
Halves family
1/2 = 0.5 = 50%
Must know instantly!