Programs for your fx-50FH II

The instructions set no limit on how many calculators you bring. With two, all 15 jobs fit: algebra on one, geometry on the other. Labels aren't allowed, so pick two you can tell apart by colour or case.

Already have the core pack? Keep its P2 and P3, replace P1 with Tangents and P4 with the Trig menu, then key the Algebra pack into the second calculator.

• Installing a programThe editor, the keys for each command, checking the bytes, fixing and deleting.
• What your calculator already does0 bytes: the built-in formulas, SD and REG, Pol, and spotting surds.

• Quadratic equationsFreeFor ax² + bx + c = 0: Δ, both roots (or the real and imaginary parts), and the vertex of the graph.
  71 bytes · about 3–6 min to key in
• Circle and lineFreeThe centre and radius of x² + y² + Dx + Ey + F = 0, then where a line y = mx + c meets it.
  118 bytes · about 5–8 min to key in
• Algebra menuFree accountFour jobs in one program area: 1 quadratic, 2 cubic with a known root, 3 simultaneous equations, 4 the least n with Sₙ > K.
  232 bytes · about 12–19 min to key in
• Triangle from three pointsFree accountFrom three vertices: the area, the in-centre and in-radius, the circumcentre, the orthocentre and the circumradius.
  246 bytes · about 9–15 min to key in
• Sine rule: an angle, both casesFree accountGiven a side, its opposite angle and another side: the angle opposite that side, as the acute answer and 180° minus it.
  27 bytes · about 1–2 min to key in
• Cubic equations in one goFree accountOne real root of ax³ + bx² + cx + d = 0 by Newton's method, then the quotient and its two roots: all three roots with no root given.
  205 bytes · about 10–16 min to key in
• Divide by x − k (remainder theorem)Free accountDivides ax³ + bx² + cx + d by x − k: the quotient's coefficients and the remainder f(k).
  38 bytes · about 2–3 min to key in
• Simultaneous linear equationsFree accountSolves a₁x + b₁y = c₁ and a₂x + b₂y = c₂.
  51 bytes · about 2–4 min to key in
• Sequences: the least n with Sₙ > KFree accountFor an arithmetic or geometric sequence: the least n whose sum passes K, with that term and that sum.
  56 bytes · about 3–5 min to key in
• Tangents to a circleFree account1: the two tangents with a given slope. 2: the two tangents from a point outside the circle. Both as y = mx + c.
  165 bytes · about 7–11 min to key in
• Trig menu: sine rule and three sidesFree account1: the sine rule for an angle, both cases. 2: all three angles from three sides, by the cosine rule.
  95 bytes · about 4–7 min to key in

We started from WebCal's catalogue of 394 programs for this calculator, dropped what is outside the syllabus or already built in, then scored each job left on four counts from 14 years of past papers (2012–2025): how often it appears, the time it saves, the slips it prevents, and how well it checks a Paper 1 answer. The packs are the highest total that fits in 680 bytes. We selected and adapted each program from that catalogue, then keyed it in and tested it on our fx-50FH II simulator.

The jobs, and how many of the 14 years each appeared in

• Quadratic: Δ, roots, vertex14 of 14
• Simultaneous equations, 2 unknowns14 of 14
• Sequences: least n with Sₙ > K14 of 14
• Sine rule, both cases14 of 14
• Cubic roots13 of 14
• Remainder and quotient by x − k13 of 14
• Circle: centre and radius13 of 14
• Line meets circle11 of 14
• Angles from three sides9 of 14
• Triangle area from vertices8 of 14
• Circumcentre and circumradius7 of 14
• In-centre and in-radius6 of 14
• Orthocentre5 of 14
• Tangents from a point4 of 14
• Tangents with a given slope3 of 14

Catalogue: WebCal, by David Cheuk