Topics
Roman Numerals
Number Work
Addition and Subtraction
Multiplication and Division
Fractions
Angles
Circles
Multiples and Factors
Decimal Fractions
- Decimal Fractions
- The Decimal Number System
- Concept of Tenths, Hundredths and Thousandths in Decimal
- Concept of Place Value
- Use of Decimal Fraction
- Writing Half, Quarter, Three-quarters and One and a Quarter in Decimal Form
- Addition of Decimal Fraction
- Subtraction of Decimal Fraction
- Decimals Used for Measurement
Measuring Time
Problems on Measurement
Perimeter and Area
Three Dimensional Objects and Nets
Pictographs
Patterns
Preparation for Algebra
Examples of Time Measurement
1. If Abdul started working on the computer at 11 in the morning and finished his work at 3:30 in the afternoon, how long did he work?
Method 1: From 11 in the morning to 12 noon, it is 1 hour. From 12 noon to 3:30 in the afternoon, it is 3 hours and 30 minutes. Therefore, the total time is 4 hours and 30 minutes.
Method 2: According to the 24-hour clock, 11 o'clock in the morning is 11:00, and 3:30 in the afternoon is 15:30
| Hr | Min |
|
15 |
30 00 |
| 4 | 30 |
Abdul worked for a total of 4 hours and thirty minutes, or four and a half hours.
2. Add: 4 hours 30 min + 2 hours 45 min
| Hr | Min |
| 4 +2 |
30 45 |
| 6 | 75 |
| 7 | 15 |
75 min = 1 hour 15 min
3. Subtract: 5 hr 30 min – 2 hr 45 min
45 minutes cannot be subtracted from 30 minutes.
Therefore, we borrow 1 hour and convert it into 60 minutes for the subtraction.
| Hr | Min |
| 4 | 60+30 |
| `\cancel(5)` – 2 |
30 45 |
| 2 | 45 |
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