##### Across

**5.**the amount, level, standard, etc. that is typical of a group of people or things**7.**he counting of numbers backward, for example from ten to zero, before something important happens**9.**a statement that two sets of numbers, letters, or symbols are equal**10.**calculations using numbers**12.**a problem or statement in mathematics or logic that must be solved or proved true or false**15.**a group of letters or numbers that represents a rule in science or mathematics**16.**Patterns and arrangements:arabesque, argyle, arrangement...**17.**a difference in the usual or expected way of doing something**18.**an expression in algebra (=a type of mathematics) that contains two or more terms**19.**a record of the number of things that someone has done, won, or achieved

##### Down

**1.**a statement, especially in mathematics, that can be proved to be true by reasoning**2.**a number or symbol used in a calculation in mathematics**3.**a series of numbers or symbols that you write when you are calculating something**4.**the lack of the ability to do basic mathematics**6.**General words relating to mathematics and geometry**8.**a position that comes after the decimal point in a decimal. 0.0164 has four decimal places**11.**an expression that has two parts connected by the sign + or the sign –, for example 2x + 3y or x – 12**13.**a measure of how likely something is to happen**14.**a simple calculation.**17.**the process of separating people or things into smaller groups or parts