Revision
Each bundle has 10 matchsticks.
99 is the last 2-digit number.
When we add 1 more matchsticks, we get
Numeral 100 is written as,
| hundreds | tens | ones | ||
| 1 | 0 | 0 |
Numeral 129 has 1 hundred, 2 tens and 9 ones.
Exercise 3.1
Write the following numbers in hundreds, tens and ones.
| Hundreds | Tens | Ones | |
|---|---|---|---|
| 1. 325 | 3 | 2 | 5 |
| 2. 568 | |||
| 3. 314 | |||
| 4. 784 | |||
| 5. 825 | |||
| 6. 917 |
Number names of 3-digit numbers.
| 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 |
Exercise 3.2
319 - Three hundred nineteen
A. Write the number names of the following numerals.
| 1. 146 | |
| 2. 764 | |
| 3. 394 | |
| 4. 823 | |
| 5. 376 | |
| 6. 409 | |
| 7. 940 | |
| 8. 274 | |
| 9. 109 | |
| 10. 894 |
B. Write the numerals for the following number names.
| One hundred nineteen | |
| Four hundred seventy five | |
| Six hundred sixty four | |
| Seven hundred thirteen | |
| Eight hundred eighty two | |
| Nine hundred sixty six | |
| Four hundred four | |
| Five hundred ninety | |
| Eight hundred twenty eight | |
| Six hundred sixty six |
3-digit numbers on an abacus
A 3 rod abacus is used to represent 3-digit numbers.
Number 100 on an abacus is shown as
Exercise 3.3
Draw beads on the abacus to show the following numbers.
Numbers 101-200
Write and practice 101 to 200
Numbers 201-300
Write and practice 201 to 300
Numbers 301-400
Write and practice 301 to 400
Numbers 401-500
Write and practice 401 to 500
Numbers 501-600
Write and practice 501 to 600
Numbers 601-700
Write and practice 601 to 700
Numbers 701-800
Write and practice 701 to 800
Numbers 801-900
Write and practice 801 to 900
Numbers 901-999
Write and practice 901 to 999
Expanded notation
The expanded notation of a 3-digit numbers as the sum of hundreds, tens and ones.
Example 3567 = 500 + 60 + 7
OR
567 = 5 hundreds + 6 tens + 7 ones
Exercise 3.4
A. Write the numerals for each of the following sums.
| 1. 300 + 50 + 6 | 356 |
| 2. 700 + 20 + 8 | |
| 3. 100 + 70 + 7 | |
| 4. 200 + 80 | |
| 5. 700 + 80 + 8 | |
| 6. 900 + 1 |
B. Write the numerals as the sum of hundreds, tens and ones.
| 1. 107 | 100 + 0 + 7 | 1 hundred + 7 ones |
| 2. 660 | ___ + ___ + ___ | |
| 3. 831 | ___ + ___ + ___ | |
| 4. 902 | ___ + ___ + ___ | |
| 5. 546 | ___ + ___ + ___ | |
| 6. 390 | ___ + ___ + ___ |