thousand, The name given to ten hundreds, digit, The numbers 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9., inequality, inequalities, When two values are not equal., is greater than, The symbol >, is less than, The symbol <, symbol, A small mark used to represent something without words, estimate, A guess of a quantity or value, range, The top and bottom limit of the possible numbers in an estimate often recorded with a hyphen in between, for example, 200-300, round, rounding, change the number to the nearest 10 or 100., compose, Put together 10s and 1s to make a 2-digit number or 100s, 10s and 1s to make a 3-digit number., decompose, Split a number into tens and ones or hundreds, tens and ones., exchange, Replacing one thing with another of the same value; for example, exchange 10 ones for 1 ten., regroup, Put hundreds, tens and ones together in different ways, to support calculating., single, One of something, associative, Addition is associative. When adding three numbers, any two numbers can be added together first, then the third., column addition, Recording an addition calculation in columns., commutative, The order does not matter, the result is the same as in addition and multiplication. 2 + 3 = 3 + 2, 5 x 4 = 4 x 5, unknown, Not known., blank, empty, mentally, Using what you already know to work something out in your head.

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