Mathematics 🔢
Numbers to 1000, Regrouping, Skip Counting, Place Value & Money
What We'll Learn
1. Numbers to 1000
Counting by Hundreds
Number Words (100s)
- 100 = one hundred
- 200 = two hundred
- 300 = three hundred
- 400 = four hundred
- 500 = five hundred
- 600 = six hundred
- 700 = seven hundred
- 800 = eight hundred
- 900 = nine hundred
- 1000 = one thousand
Example: 347 is read as "three hundred forty-seven"
Filipino: tatlong daan at apatnapu't pito
2. Place Value
Three-Digit Numbers
Every three-digit number has:
548 = 5 hundreds + 4 tens + 8 ones
= 500 + 40 + 8 = 548
Place Value Chart
| Number | Hundreds | Tens | Ones |
|---|---|---|---|
| 234 | 2 | 3 | 4 |
| 506 | 5 | 0 | 6 |
| 890 | 8 | 9 | 0 |
Remember: The value of a digit depends on its PLACE in the number.
In 555: the first 5 = 500, middle 5 = 50, last 5 = 5
3. Addition with Regrouping
What is Regrouping?
When the sum of digits in a column is 10 or more, we need to regroup (carry over) to the next column.
Example: 47 + 35 = ?
Step 1: Add Ones
7 + 5 = 12
Write 2, carry 1
Step 2: Add Tens
4 + 3 + 1 = 8
Include carried 1
Step 3: Answer
82
Practice Problems
28
+ 34
62
56
+ 27
83
145
+ 238
383
367
+ 455
822
4. Subtraction with Regrouping
Borrowing in Subtraction
When the top digit is smaller than the bottom digit, we need to borrow from the next column.
Example: 52 - 38 = ?
Step 1: Check Ones
2 - 8 = ?
2 is smaller, need to borrow
Step 2: Borrow
12 - 8 = 4
5 becomes 4
Step 3: Subtract Tens
4 - 3 = 1
= 14
Practice Problems
63
- 27
36
81
- 45
36
432
- 158
274
700
- 234
466
5. Skip Counting
Count by 2s
2, 4, 6, 8, 10, 12, 14, 16, 18, 20...
Count by 5s
5, 10, 15, 20, 25, 30, 35, 40, 45, 50...
Count by 10s
10, 20, 30, 40, 50, 60, 70, 80, 90, 100...
Count by 25s
25, 50, 75, 100, 125, 150, 175, 200...
Count by 100s
100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
Use Skip Counting: When counting money, objects in groups, or multiplying!
6. Philippine Money
Philippine Coins
Sentimo
Limang Sentimo
Bente-singko
Piso
Limang Piso
Sampung Piso
Philippine Bills
Dalawampung Piso
Limampung Piso
Isandaang Piso
Dalawandaang Piso
Limandaang Piso
Isanlibong Piso
Counting Money
Example: Count the total value
Making Change: If something costs ₱37 and you pay ₱50, your change is ₱50 - ₱37 = ₱13
What We Learned!
- ★Numbers up to 1000
- ★Hundreds, Tens, and Ones places
- ★Addition with carrying/regrouping
- ★Subtraction with borrowing
- ★Skip counting by 2s, 5s, 10s, 25s, 100s
- ★Philippine coins and bills