Numbers
"Discover hundreds, tens and ones."
A Today you'll learn
- Read and write numbers up to 1000
- Compare numbers using more than, less than and equal to
- Understand place value: hundreds, tens and ones
B Let's understand
356 = 300 + 50 + 6
Every number up to 1000 is made of hundreds, tens and ones. For example, 356 means 3 hundreds, 5 tens and 6 ones. Writing a number in this broken-up form is called expanded form, and it helps us understand how big a number really is. To compare two numbers, we first look at which one has more hundreds; if the hundreds are equal, we look at the tens; if the tens are equal too, we look at the ones.
C See it step by step
- 356 has 3 hundreds, 5 tens and 6 ones.
- 3 hundreds = 300. 5 tens = 50. 6 ones = 6.
- So 356 = 300 + 50 + 6.
- Both numbers have 7 hundreds, so the hundreds are equal.
- Compare the tens: 724 has 2 tens, 719 has 1 ten.
- 2 tens is greater than 1 ten, so 724 > 719.
D Your turn
E Ready to practise?
A 3-digit number has a hundreds place
A 3-digit number has a hundreds place, a tens place and a ones place.
Key idea 2
The symbol > means "greater than" and < means "less than".
Key idea 3
The biggest 3-digit number is 999; the smallest is 100.
Key idea 4
Expanded form shows a number as hundreds + tens + ones.
Zero as a placeholder matters
Zero as a placeholder matters: 205 is not the same as 25.
correct