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- Time
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- Addition and Subtraction of Time
- Subtraction of Time
3. Addition
4. Subtraction
7. Division
7.4. Long Division
8.1.1. Factors
8.1.1.1. Finding Factors of a Number
8.1.1.2. HCF (Highest Common Factor)
8.1.2. Multiples
8.1.2.1. Finding Multiples of a Number
8.1.2.2. LCM (Lowest Common Multiple)
8.2. Types of Numbers
8.2.1. Odd and Even Numbers
8.2.1.1. Even Numbers
8.2.1.2. Odd Numbers
8.2.2. Prime and Composite Numbers
8.4.1. Test Divisibility by 2
8.4.2. Test Divisibility by 3
8.4.3. Test Divisibility by 5
8.4.4. Test Divisibility by 6
8.4.5. Test Divisibility by 9
8.4.6. Test Divisibility by 10
9. Patterns
10. Rounding Numbers
10.1. Rounding Off Numbers
10.1.1. Rounding Off to the Nearest Ten
10.2. Estimating Sum
10.3. Estimating Difference
10.4. Estimating Products
11. Fractions
11.4. Division as Fraction
11.5. Fraction as Division
11.7. Equivalent Fractions
11.8. Comparison of Fractions
11.10. Unit Fraction
11.12.1. Addition of Like Fractions
11.12.2. Subtraction of Like Fractions
12. Decimals
12.1. Conversions
13. Money
14. Measurement
14.1. Measurement of Length
14.1.2.1. Addition of Lengths
14.1.2.1.1. Addition of Lengths in Meters and Centimeters
14.1.2.1.2. Addition of Lengths in Kilometers and Meters
14.1.2.2. Subtraction of Lengths
14.1.2.2.1. Subtraction of Lengths in Meters and Centimeters
14.1.2.2.2. Subtraction of Lengths in Kilometers and Meters
14.1.3. Word Problems on Length
14.1.3.1. Word Problems on Addition of Lengths
14.1.3.2. Word Problems on Subtraction of Lengths
14.2. Measurement of Weight
14.2.2.1. Addition of Weights
14.2.2.1.1. Addition of Weights in Grams and Milligrams
14.2.2.1.2. Addition of Weights in Kilograms and Grams
14.2.2.2. Subtraction of Weights
14.2.2.2.1. Subtraction of Weights in Grams and Milligrams
14.2.2.2.2. Subtraction of Weights in Kilograms and Grams
14.2.3. Word Problems on Weights
14.2.3.1. Word Problems on Addition of Weights
14.2.3.2. Word Problems on Subtraction of Weights
14.3. Measurement of Capacity
14.3.3. Word Problems on Capacity
14.3.3.1. Word Problems on Addition of Capacity
14.3.3.2. Word Problems on Subtraction of Capacity
15. Unitary Method
16. Geometry
16.2. Measure Line Segments
16.4. Types of Lines
16.4.1. Straight and Curved Lines
16.4.3. Open and Closed Shapes
16.5. Polygons
16.6. Circle
19. Symmetry
19.1. Introduction to Symmetry
19.3. Symmetry Around Us
19.5. Symmetry in Alphabets
19.6. Symmetry in Numerals
20. Time
20.1. Clock
20.1.2. Measuring Time
20.1.3. 24-Hour Clock Time
20.1.4. Use of 'AM' and 'PM'
20.1.5. Addition and Subtraction of Time
20.2. Calendar
21. Data Handling
21.1. Basic Definition of Data
21.2. Pictographs
21.3. Bar Graphs
21.3.1. Drawing Bar Graphs
21.3.2. Interpreting Bar Graphs
Grade 4 Hong Kong School Math Subtraction of Time
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