Hundreds, tens and ones
🎯 In this topic you will
- Say, read, and write numbers and number words from 0 to 1000.
- Explain the value of each digit in a three-digit number.
- Count forwards and backwards in steps of 1 and 10 from any number.
🧠 Key Words
- thousand
Show Definitions
- thousand: A number equal to 1,000, which is ten hundreds or one unit in the thousands place.
🔢 Understanding 3-Digit Numbers
T hree-digit numbers are made up of hundreds, tens, and ones. Each digit has a place, and its position tells us how much it is worth.
📍 Place Value of Digits
F or example, in the number 327, the digit 3 represents 300, the digit 2 represents 20, and the digit 7 represents 7. Adding these values together gives the total value of the number.
🧠 Why Place Value Matters
Y ou need to know what each digit represents to understand the value of the whole number. This helps you read, write, compare, and work confidently with numbers.
❓ EXERCISES
1. Complete these pieces, which are from a $1$ to $1000$ number grid.
👀 Show answer
Right $+1$, Left $-1$, Down $+10$, Up $-10$.
From $132$: $142, 152, 153, 154, 155, 125, 115$.
From $479$: $469, 489, 478, 480$.
From $256$: $246, 266, 255, 257$.
From $147$: $146, 157, 156$.
From $782$: $772, 792, 781, 783$.
2. Complete the missing numbers.
👀 Show answer
$913 = 900 + 10 + 3$
$500 + 70 + 6 = 576$
$300 + 90 + 5 = 395$
3. What $3$-digit number is shown in each place value grid?
👀 Show answer
b) $632$
4. What $3$-digit number is represented below?
👀 Show answer
❓ EXERCISES
5. What is the value of the ringed digit in each $3$-digit number?
a. $6\circled{3}7$
b. $\circled{9}21$
c. $76\circled{8}$
d. $10\circled{9}$
e. $3\circled{9}4$
f. $\circled{2}53$
👀 Show answer
b. $900$
c. $8$
d. $9$
e. $90$
f. $200$
🧠 Think like a Mathematician
Tomas made nine $3$-digit numbers using a set of place value cards. Seven of the numbers are $473$, $689$, $358$, $134$, $925$, $247$ and $791$. What could the other two numbers be?
Compare your numbers with those of someone else in your class. If your numbers are different, can you explain why?
👀 Show answer
One possible pair of numbers is $861$ and $594$.
The exact answers may be different because the same place value cards can be arranged in different orders to make different $3$-digit numbers. As long as no digit card is reused and all numbers are valid, multiple correct solutions are possible.
❓ EXERCISES
6. Use these number words to write four $3$-digit numbers.
Words: hundred, eight, and, seventy-, fifty-, three
👀 Show answer
$853$
$873$
$583$
$573$
Other answers are possible as long as the given words are used correctly to form valid $3$-digit numbers.