Take three hands-up answers, not open call-outs. Don't settle the argument yet — let the disagreement sit. Some pupils will say they are the same, some will not be sure the percentage matches. That tension is the hook for the whole lesson.

1/2 sets the pattern: one half, 0.5, 50%. Get the class saying all three forms together.

1/4: before the reveal ask, if a half is 50%, what's a quarter? Draw out that a quarter is half of a half, so 25 is half of 50. Reading: one quarter, 0.25, 25%.

1/10: stress ten parts out of a hundred so the 10% feels earned. Reading: one tenth, 0.1, 10%.

Between 1/10 and 1/8, pause: name a pupil to predict the 1/8 percentage, then revoice their reasoning.

1/8 is the key one, so slow right down. One eighth is half of a quarter, so half of 25% is 12.5%; the decimal runs to three places, 0.125. The panel only shows whole numbers so it rounds to 13%, but the true reading is 12.5%. The three-place decimal and the and-a-half catch pupils out.

This round is for talking it through together — pupils take turns at the board and the class agrees or corrects out loud.

Open by setting 1/5 yourself as the warm-up anchor (0.2, 20%), then hand the slider to pupils for 2/5, 3/5 and 3/4. Before each reveal, ask the class to predict the percentage. The fifths are the reasoning spine — revoice a pupil who spots that 2/5 is just twice 1/5, so 40% is twice 20%. Watch for pupils who read the fraction panel but skip the decimal; make them say all three each time.

These are the practice questions — pupils take turns at the board, check each answer, and the class confirms before moving on. Keep the board work brisk rather than over-explaining.

Each target names one form; before Check, have the class call the other two. The 1/8 target is the hardest — remind the class the true value is 12.5% even though the panel rounds to 13%, so a pupil who answers 12.5% is correct. Revoice the reasoning: eighths are trickier because their decimals run to three places.