This reviewer covers the DepEd Most Essential Learning Competencies (MELC) in Grade 4 Mathematics. Master each topic below to prepare for quizzes, periodical tests, and assessments.
Numbers, Factors, and Multiples
Work with numbers up to 100,000. Find factors, multiples, prime and composite numbers, and the GCF and LCM.
| Term | Meaning | Example |
|---|---|---|
| Factor | Divides a number exactly | Factors of 12: 1,2,3,4,6,12 |
| Multiple | Product of a number | Multiples of 4: 4,8,12,16 |
| Prime | Exactly 2 factors | 2,3,5,7,11 |
| Composite | More than 2 factors | 4,6,8,9 |
GCF (Greatest Common Factor) is the biggest factor shared by two numbers — used to simplify fractions. LCM (Least Common Multiple) is the smallest shared multiple — used to add unlike fractions.
Fractions and Decimals
Add and subtract similar and dissimilar fractions, change improper fractions to mixed numbers, and read/write decimals to hundredths.
To add fractions with different denominators, first make them the same using the LCM. Never add the denominators together.
Geometry
Identify and describe lines, angles, polygons, and circles. Recognize symmetry.
| Angle | Size |
|---|---|
| Acute | less than 90° |
| Right | exactly 90° |
| Obtuse | between 90° and 180° |
Measurement
Find perimeter and area of squares and rectangles, and convert units of length, mass, and capacity.