Keystones — Bedrock

Five GCSE retrieval questions · 20 September 2024 · mathsvault.uk/keystones

1. Number

Simplify: 9³ × 9⁵

Answer: 9⁸
2. Algebra

Simplify: 2x + 8x

Answer: 10x
3. Geometry

Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Calculate 50% of 176

Answer: 88
5. Statistics

Find the mean of: 12, 15, 15, 20

Answer: 15.5

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