Master place value and expanded notation up to one million. This lesson covers SEA Mathematics Objectives 1-9 from the Number Strand.
By the end of this lesson, you will be able to:
In the SEA Mathematics paper, the Number Strand has 19 items worth 34 marks—that’s 45% of your total Math score! (SEA Framework Page 18-19)
Start by watching this video to understand the basics of place value. Take notes as you watch!
Did you understand the video? Review the notes below before continuing!
Every digit (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) in a number has a Place and a Value.
| Millions | Hundred Thousands | Ten Thousands | Thousands | Hundreds | Tens | Units |
|---|---|---|---|---|---|---|
| 1 | 2 | 5 | 4 | 3 | 8 | 9 |
| Digit | Place | Value |
|---|---|---|
| 1 | Hundred Thousands | 100,000 |
| 2 | Ten Thousands | 20,000 |
| 5 | Thousands | 5,000 |
| 4 | Hundreds | 400 |
| 3 | Tens | 30 |
| 9 | Units | 9 |
In the SEA exam, you may be asked to write a number in words.
| Numeral | Word Name |
|---|---|
| 45,200 | Forty-five thousand two hundred |
| 304,010 | Three hundred and four thousand and ten |
| 1,000,000 | One million |
| 78,654 | Seventy-eight thousand six hundred and fifty-four |
Don’t write “and” between thousands and hundreds unless there are no tens/units.
Now watch this video to learn how to write numbers in expanded notation.
Expanded notation means breaking the number apart to show the value of each digit.
50,000 + 2,000 + 300 + 0 + 1
(5 × 10,000) + (2 × 1,000) + (3 × 100) + (0 × 10) + (1 × 1)
This is an Applying skill (Section II style question).
When comparing two numbers, look at the digit in the highest place value first.
45,678 or 45,876
Test your understanding! Select an answer for each question.
Great job finishing this lesson. You’re one step closer to acing your SEA exam!
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