# Maths

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- Created by: Amy
- Created on: 19-11-12 16:57

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- Numbers and arithmetic
- Rounding
- Round up if 5 or more
- When done to s.f - start counting from the first non 0.

- Bounds
- Measurements are not exact
- Usually upper bound ± .5 (or .05...)

- Multiplying and diving
- Estimation
- Standard form to approximate sums with big numbers
- Approximations to one s.f for normal sums

- Fraction calculations
- Need to have the same denominator

- Fractions, decimals and percentages
- If the only factors of the denominator are 2 and/or five, it won't be recurring
- Fraction to decimal: numerator divided by denominator
- Fraction to percentage: numerator divided by denominator times 100

- Rounding

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