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Today's Keystones

Five retrieval questions for today — one from each strand. The five skills stay the same for the week, with new numbers each day. Choose your tier, then have a go.

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Lintel · Grades 5–7 Keystones #311 7 November 2026 (today) Skills week 3 of 7

Keystones — Lintel

Five GCSE retrieval questions · 7 November 2026

  1. 1. Number Multiplying in standard form

    Calculate: 6.6 × 105 × 9.3 × 103

    Answer: 6.138 × 109
  2. 2. Algebra Solving monic quadratics

    Solve: x² + 2x - 15 = 0

    Answer: x = 3 or x = -5
  3. 3. Geometry SOHCAHTOA — missing angle

    Adjacent = 25cm, hypotenuse = 33cm. Find the angle

    Answer: 40.7°
  4. 4. Ratio Reverse percentages

    A price of £597.80 includes a 22% increase. What was the price before the increase?

    Answer: £490.00
  5. 5. Statistics Range

    Calculate the range of: 31, 75, 33, 24, 93, 66

    Answer: 69

Same five questions for everyone on Lintel today. Only today's set is shown here — a new set appears at midnight UK time.