1. Number
Worth roughly a quarter of the marks on Foundation papers and much less on Higher, where it mostly appears inside other questions.
- Place value; ordering integers, decimals and negative numbers
- The four operations with integers, decimals and negatives, by written methods without a calculator
- Order of operations, including powers and brackets
- Factors, multiples and primes; writing a number as a product of prime factors
- Highest common factor and lowest common multiple, including with Venn diagrams
- Squares, cubes, square roots and cube roots
- Laws of indices with whole-number powers, including zero and negative powers
- Fractional indices, such as 272/3 and 16−1/2 (Higher)
- Standard form: converting, and calculating with and without a calculator
- Fractions: equivalence, simplifying, all four operations, mixed numbers
- Moving between fractions, decimals and percentages; terminating decimals
- Converting recurring decimals to fractions by the algebraic method (Higher)
- Simplifying surds, such as √48 = 4√3, and exact calculation with them (Higher)
- Rationalising a denominator, such as 6/√3 or 1/(2 + √3) (Higher)
- Rounding to decimal places and significant figures; estimating answers
- Error intervals written as inequalities, such as 6.5 ≤ x < 7.5
- Upper and lower bounds in calculations, such as the greatest possible speed (Higher)
- Listing outcomes systematically
- The product rule for counting, such as how many four-digit codes exist (Higher)
- Calculator skills: fractions, powers, roots, standard form and the memory