Number Sense Practice #2

The Order of Operations is a set of rules that determines the sequence in which calculations are performed in a mathematical expression. The acronym PEMDAS helps remember the order: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

95

Dividing by a fraction is the same as multiplying by its reciprocal. For example, dividing by $$\frac{1}{4}$$ is the same as multiplying by 4.

24

Dividing by a fraction means to find out how many times the fraction fits into the number. For example, $$9 \div \frac{1}{3}$$ means how many thirds are in 9.

27

An exponent indicates how many times a number (the base) is multiplied by itself. For example, in $$4^2$$ , 4 is the base and 2 is the exponent, meaning $$4 \times 4$$ .

10

A variable is a symbol (often a letter) that represents an unknown value in an equation. For example, in the equation $$x + 7 = 12$$ , x is the variable.

x = 5