Mathématiques 5ème - Opérations et Formes Géométriques

Math Review - Grade 5

Multiplication and Division

• Multiplication is repeated addition
• Division is repeated subtraction
• Examples: 2 × 3 = 2 + 2 + 2 = 6, 6 ÷ 2 = 6 - 2 - 2 = 3

Fractions

• A fraction represents part of a whole
• Numerator (top number) indicates how many parts
• Denominator (bottom number) indicates total parts
• Example: 3/4, 3 parts out of 4 total parts

Classifying Polygons

• Polygons are shapes with 3 or more sides and angles
• Types of polygons: triangles, quadrilaterals, pentagons, hexagons, etc.
• Classification based on number of sides

Triangles and Angles

• A triangle is a polygon with 3 sides and 3 angles
• Angles can be acute (< 90°), right (90°), or obtuse (> 90°)
• Properties of triangles: equal sides, equal angles, congruent triangles

Order Pairs

• An order pair is a pair of numbers written in a specific order (x, y)
• x represents the horizontal coordinate, y represents the vertical coordinate
• Example: (3, 4), x = 3, y = 4

Converting Units of Measurement

• Unit conversions: kg to g, m to cm, L to mL, ton to kg
• 1 kg = 1000 g, 1 m = 100 cm, 1 L = 1000 mL, 1 ton = 1000 kg
• Conversion rules: multiply or divide by conversion factor

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