Primary 3 - Math
Chapter 2: Multiplication, Division & Operations
Applied Mathematics: Multi-Step Word Problems, Perimeter & Area
Click any sentence to listen 👆
In this exciting real-world lesson, we apply multiplication and division to solve multi-step problems. We also explore practical geometry to distinguish between 'Perimeter' (the linear distance around the outer boundary) and 'Area' (the number of square units covering the inner surface) of rectangles and squares.
📐 Perimeter vs Area: Know the Difference
| Geometric Concept | Meaning & Visual Idea | Mathematical Formula | Measurement Unit |
|---|---|---|---|
| Perimeter (P) | Distance around the outside edge (like garden fencing) | Sum of all side lengths Rectangle: 2 × (Length + Width) |
Linear units (cm, m) |
| Area (A) | Square units needed to tile the inside surface (like carpet) | Rectangle: Length × Width Square: Side × Side |
Square units (cm², m²) |
📝 3-Step Strategy for Multi-Step Problems
- Understand: Identify known numbers and the final unknown goal.
- Plan: Decide which operation comes first (multiply or add) and which follows (subtract or divide).
- Compute & Label: Carry out steps with correct units (pounds, cm, square meters).
Geometry & Multi-Step Exercises
Solution:
• Perimeter = (6 + 4) × 2 = 10 × 2 = 20 cm.
• Area = 6 × 4 = 24 cm².
• Perimeter = (6 + 4) × 2 = 10 × 2 = 20 cm.
• Area = 6 × 4 = 24 cm².
Solution: Area of square = side × side = 5 × 5 = 25 m².
Solution in 2 steps:
1. Cost of notebooks = 4 × 8 = 32 pounds.
2. Money left = 50 - 32 = 18 pounds.
1. Cost of notebooks = 4 × 8 = 32 pounds.
2. Money left = 50 - 32 = 18 pounds.
Tap any card to reveal its meaning, or tap the audio icon to listen:
perimeter
Tap to reveal definition 👆
محيط الشكل الهندسي الخارجي
📖 Def: continuous line forming the boundary of a closed geometric figure
area
Tap to reveal definition 👆
مساحة السطح الداخلي
📖 Def: extent or measurement of a surface
square unit
Tap to reveal definition 👆
وحدة مربعة (سم² أو م²)
📖 Def: unit of area measurement
rectangle
Tap to reveal definition 👆
مستطيل رباعي الأضلاع
📖 Def: plane figure with 4 straight sides and 4 right angles
square
Tap to reveal definition 👆
مربع متساوي الأضلاع
📖 Def: plane figure with 4 equal straight sides
dimension
Tap to reveal definition 👆
أبعاد الشكل (طول وعرض)
📖 Def: measurable extent like length and width
boundary
Tap to reveal definition 👆
حد وسياج خارجي للشكل
📖 Def: line marking the limits of an area
tiling
Tap to reveal definition 👆
تبليط وتغطية السطح بالوحدات
📖 Def: covering surface completely without gaps
multi-step
Tap to reveal definition 👆
مسألة متعددة الخطوات
📖 Def: problem requiring multiple consecutive operations
remaining
Tap to reveal definition 👆
المتبقي بعد الشراء أو الصرف
📖 Def: amount left over
label
Tap to reveal definition 👆
تمييز وحدة القياس
📖 Def: designating term such as cm or pounds
formula
Tap to reveal definition 👆
قانون وقاعدة رياضية
📖 Def: mathematical rule expressed in symbols
Click on an option to check your answer and view the detailed explanation:
1
2
3
4
5
6
7
8
🎉 Congratulations! You have completed all lesson stations successfully!