Practice Flashcards: National 5 Mathematics: expressions and formulae | Zestly

Question 1

Simplifying surds rule

Accepted Answer

Find the largest square factor of the number under the root. Example: $\sqrt{20} = \sqrt{4 	imes 5} = 2\sqrt{5}$.

Question 2

Multiplication index law

Accepted Answer

$x^a \cdot x^b = x^{a+b}$. Example: $x^2 \cdot x^3 = x^5$.

Question 3

Division index law

Accepted Answer

$x^a \div x^b = x^{a-b}$. Example: $x^5 \div x^2 = x^3$.

Question 4

Power of a power rule

Question 5

Fractional index rule

Question 6

Difference of two squares

Question 7

Perfect square trinomial

Question 8

Expanding binomials (FOIL)

Question 9

Changing the subject

Question 10

Significant figures rule

Question 11

Substitution of negative values

Question 12

Simplifying algebraic fractions