The learning competencies in Numbers and Number Sense are describes and illustrates well-defined sets, subsets, universal set and the null set; defines and describes the union and intersection of sets and the complement of a set; uses Venn Diagrams to represent sets, subsets and set operations; solves problems involving sets; describes and illustrates the absolute value of a number on a number line as the distance of the number from 0; performs fundamental operations on integers; addition, subtraction, multiplication, division; states and illustrates the different properties of the operations on integers (commutative, associative, distributive, identity, inverse); defines and illustrates rational numbers and arrange them on a number line; expresses rational numbers terminating and repeating and non-terminating) from fraction form to decimal form and vice versa; performs operations on rational numbers and illustrate their properties; describes principal roots and tells whether they are rational or irrational; determines between what two integers the square root of a number is; estimates the square root of a number to the nearest tenth; illustrates and graphs irrational numbers (square roots) on a number line with and without appropriate technology; describes, represents and compares the different subsets of real numbers; finds the union, intersection and complement of the set of real numbers and its subsets; arranges real numbers in increasing or decreasing order; determines the significant digits in a given situation; writes very large or very small numbers in scientific notation; describes and represents real-life situations which involve integers, rational numbers, square roots of a rational numbers and irrational numbers; solves problems involving real numbers