Math Terms Definitions If you are a member, log in to remove the lines; non-members need to subscribe. 1. Addend: the numbers added in an addition problem. (in 7+4+8, the numbers 7, 4 and 8 are called this) 2. Average: add the sum of a group of numbers then divide the total by the number of addends used. 3. Coordinates: an ordered pair of numbers that locates a point with reference to the x- and y-axes. 4. Decimal: a number with one or more digits to the right of a decimal point. 5. Denominator: the number below the bar in a fraction. 6. Difference: the result of subtraction. 7. Dividend: the number that is divided in a division problem. 8. Divisor: the number by which a number is being divided. 9. Equation: a mathematical sentence with an equal sign. 10. Estimate: a number close to the exact amount. 11. Factor: one of two or more numbers that are multiplied to give a product. 12. Fraction: a number that names a part of whole. 13. Integers: the set of positive whole numbers, their opposites (negative numbers) and 0. 14. Mean: also called average, the number found by dividing the sum of a group of numbers by the number of addends. 15. Median: the middle number when a set of number is arranged in order from least to greatest. 16. Mixed numbers: a number that is the sum of a whole number and a fraction. 17. Mode: the number or numbers that occur most often in a set of data (or set of numbers). 18. Numerator: the number above the bar in a fraction. 19. Prime Number: a whole number, greater than 1, that has exactly two factors. 20. Probability: the chance of an event occurring. 21. Product: the answer in a multiplication problem. 22. Quotient: the answer in a division problem.