# Appendix, Mathematics Glossary

Glossary
An updated Primary Mathematical Glossary is now available to view/download. (PDF, 968KB)

## Glossary

These descriptions are intended to be a help to primary teachers and are not necessarily the full mathematical definition of the term .

 algorithm a logical, arithmetical or computational procedure that, if correctly applied, ensures the solution of a problem analogue clock a clock on which hours, minutes and sometimes seconds are indicated by hands on a dial are a unit of area equal to 100 square metres associative an operation such as multiplication or addition is associative if the same answer is produced regardless of the order in which the elements are grouped, e.g.(2 +3) + 5 = 10, 2 + (3 + 5) = 10 cardinal number a number denoting quantity but not order in a set commutative giving the same result irres p e c t i ve of the order of the el ements in addition and multiplication6 + 2=82 + 6=85x7=357x5= 35 composite number a number with more than two factors that is not a prime number, e.g. 6, 10 denominator the divisor in a fraction diameter a straight line connecting the centre of a circle with two points on the perimeter distributive the same result is produced when multiplication is performed on a set of numbers as when performed on the members of the set individually, e.g. 5 x 4 = (3 + 2) x 4 = (3 x 4) + (2 x 4 ) dividend a number or quantity to be divided by another number or quantity divisor a number or quantity to be divided into another number or quantity equation a mathematical sentence with an equals sign hectare a unit of area equal to 100 ares line symmetry a shape has line symmetry if one half of the shape can be folded exactly onto the other half number sentence an equation or statement of inequality e.g. 4 + x = 11, 4 x 2 < 12 or 2 + 5 = 7 numerator the number above the line in a fraction ordinal number a number denoting relative position in a sequence, e.g. first, second, third perimeter the sum of the length of the sides of a figure or shape prime factor a factor that is a prime number prime number a whole number that has only two factors, itself and 1, e.g. 2, 3, 7 radius a straight line from the centre of a circle to a point on the circumference; a radius is half the diameter ratio the relationship between two nu m b e rs of the same kind; e.g. the ratio of 2 kg to 6 kg is 2:6 subitise tell at a glance, without counting, the number of items in a set subtrahend the number to be subtracted from another number, e.g. 10 - 4 (4 is the subtrahend ) tessellation shapes tessellate if they fit together exactly, form a repeating pattern, and make an angle of 360 degree at thepoints of contact variable a letter or symbol that stands for a number, e.g. y + 7 = 12

## Membership of the Curriculum Committee for Mathematics

This curriculum has been prepared by the Curriculum Committee for Mathematics established by the National Council for Curriculum and Assessment.

 Chairpersons Fiona Poole Irish National Teachers' Organisation Pat Scanlan Irish National Teachers' Organisation Committee members Olivia Bree Irish Federation of University Teachers Claire Breslin Department of Education and Science Br Michael Broderick Teaching Brothers' Association/Association of Primary Teaching Sisters Wyn Bryan Irish Federation of University Teachers Sr Anne Dempsey Association of Primary Teaching Sisters/Teaching Brothers' Association Ena Fitzpatrick Irish National Teachers' Organisation Patrick Hurley Irish National Teachers' Organisation Ita McGrath Irish National Teacher's Organisation Liam Morrissey Irish National Teachers' Organisation Catherine Mulryan Management of Colleges of Education Paddy O'Brien (from 1993) Catholic Primary School Managers Association Sean O Cearbhaill Department of Education and Science Noel O'Connell Management of Colleges of Education Valerie O'Dowd Irish National Teachers' Organisation Finbar O'Driscoll Irish National Teachers' Organisation Tadhg O Glaimhin Department of Education and Science Elizabeth Oldham Church of Ireland General Synod Board of Education Sr Veronica O'Rourke (to 1993) Catholic Primary School Managers' Association Maria Spring Catholic Primary School Managers' Association Nicola Twigg Church of Ireland General Synod Board of Education Eibhlin Ui Bhriain National Parents Council - Primary Eugene Wall Irish Federation of University Teachers Education officers Sean Close Valerie O'Dowd Fiona Poole Pat Scanlan Nicola Twigg

## Membership of the Primary Co-ordinating Committee

To co-ordinate the work of the Curriculum Committees, the Primary Co-ordinating Committee was established by the National Council for Curriculum and Assessment.

 Chairperson Tom Gilmore Committee members Sydney Blain(from 1995) Church of Ireland General Synod Board of Education Liam O hEigearta(from 1996) Department of Education and Science Dympna Glendenning(to 1995) Irish National Teachers' Organisation Fionnuala Kilfeather(from 1995) National Parents Council - Primary Eamonn MacAonghusa(to 1996) Department of Education and Science Fr. Gerard McNamara(from 1995) Catholic Primary School Managers Association Peter Mullan Irish National Teachers' Organisation Sheila Nunan(from 1995) Irish National Teachers' Organisation Eugene Wall Irish Federation of University Teachers Co-ordinator Caoimhe Mairtin(to 1995) Assistant Chief Executive Primary Lucy Fallon-Byrne(from 1995) Chief Executive Albert O Ceallaigh

NCCA Chairpersons: Dr Tom Murphy (to 1996), Dr Caroline Hussey (from 1996).

NCCA, 24 Merrion Square, Dublin 2, Telephone: +353 1 661 7177, Fax: +353 1 661 7180, E-mail: info@ncca.ie