Chapter 1: Numbers and Operations
What you need to learn in this chapter
In this chapter, we will be learning about whole numbers and basic operations. We will start by understanding number value, which includes reading and writing numbers up to 100,000 in words and numerals. We will also learn how to determine the value of numbers, compare them, and arrange them in order.
Next, we will explore odd numbers and even numbers. We will learn how to identify and differentiate between them.
We will also learn about estimation, which involves giving reasonable estimates for quantities based on a given reference set. We will practice justifying our answers.
Lastly, we will learn how to round off whole numbers to the nearest ten thousands. We will understand the concept of rounding off and practice applying it.
Let's get ready to explore the world of whole numbers and basic operations!
Topics in this chapter
1. Number value
What you will learn in this topic
- State numbers up to 100 000: (i) Read any number given in words. (ii) Say any number given in numerals. (iii) Write numbers in numerals and words
- Determine the value of numbers up to 100 000: (i) State the place value and digit value of any number. (ii) Write numbers in extended notation based on place value and digit value. (iii) Compare the value of two numbers. (iv) Arrange numbers in ascending and descending order. (v) Complete any number sequence in ascending and descending order
2. Odd numbers and even numbers
What you will learn in this topic
- Characterise odd numbers and even numbers
- Classify odd numbers and even numbers
3. Estimate
What you will learn in this topic
- Give reasonable estimates for the quantity based on the given reference set and justify the answers
4. Round off numbers
What you will learn in this topic
- Round off whole numbers to the nearest ten thousands
5. Number patterns
What you will learn in this topic
- Identify patterns of number series in ascending and descending order by ones up to tens, hundreds, thousands and ten thousands
- Complete various number patterns of number series in ascending and descending order by ones up to tens, hundreds, thousands and ten thousands
6. Basic operations within 100 000
What you will learn in this topic
- Solve addition number sentences involving up to four numbers with the sum within 100 000
- Solve subtraction number sentences involving two numbers within 100 000
- Solve subtraction number sentences involving two numbers from any one number within 100 000
- Solve multiplication number sentences involving any number up to five digits by up to two-digit numbers, 100 and 1000 with the product up to 100 000
- Solve division number sentences involving any number within 100 000 by up to two-digit numbers, 100 and 1000
7. Mixed operations
What you will learn in this topic
- Solve mixed operations number sentences involving addition and subtraction within 100 000
- Solve mixed operations number sentences involving multiplication and division within 100 000
8. Usage of unknown
What you will learn in this topic
- Determine the value of unknown in addition number sentences involving two numbers up to two digits with one unknown
- Determine the value of unknown in subtraction number sentences involving two numbers up to two digits with one unknown.
9. Problem solving
What you will learn in this topic
- Solve problems of whole numbers, mixed operations involving addition and subtraction, and mixed operations involving multiplication and division within 100 000 in daily situations
- Solve problems involving addition and subtraction with one unknown in daily situations
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