Keystones Bedrock — 17 October 2021

Keystones — Bedrock

Five GCSE retrieval questions · 17 October 2021 · mathsvault.uk/keystones

1. Number

Simplify: 5⁴ × 5³

Answer: 5⁷
2. Algebra

Expand: 4(x + 5)

Answer: 4x + 20
3. Geometry

Opposite = 15cm, hypotenuse = 17.3cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify the ratio 18:15

Answer: 6:5
5. Statistics

Find the mean of: 17, 10, 8

Answer: 11.666666666667

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