Getting ready…
Getting ready…
Here is a number made with base 10 blocks.
The flat squares are hundreds, the rods are tens and the little cubes are ones.
There are 3 hundreds, 4 tens and 5 ones.
The number is 345.
Picture: Base 10 blocks showing 345: 3 hundreds, 4 tens and 5 ones.
In a place value chart, each digit has a place: hundreds, tens and ones.
We can partition 345, which means split it into its parts.
The 3 is in the hundreds place, so it is worth 300. The 4 is worth 40. The 5 is worth 5.
345 = 300 + 40 + 5
Picture: A place value chart showing 345: 3 hundreds, 4 tens and 5 ones. It is split into 300, 40 and 5.
Your turn: Here are 2 hundreds, 6 tens and 3 ones. What number is this?
Picture: Base 10 blocks with 2 hundreds, 6 tens and 3 ones.
Choose one:
The answer: 263
2 hundreds, 6 tens and 3 ones make 263.
Picture: Base 10 blocks showing 263: 2 hundreds, 6 tens and 3 ones. It is split into 200, 60 and 3.
Here is 407, four hundred and seven.
It has 4 hundreds, 0 tens and 7 ones.
There are no tens, so we write a 0 in the tens place.
The 0 holds the place. It keeps the 4 in the hundreds place.
Picture: A place value chart showing 407: 4 hundreds, 0 tens and 7 ones. The tens column is highlighted.
Now let's read and write numbers in words.
345 is three hundred and forty-five.
We say the hundreds, then "and", then the tens and ones.
In words we write: three hundred and forty-five.
Picture: The sentence "345 is three hundred and forty-five.", with "and" underlined.
I can read, write, compare and order numbers to 1,000.
Mei's number is 430. Sam's number is 460. Which is greater?
Compare the hundreds first. Both have 4 hundreds.
Now compare the tens. 6 tens is more than 3 tens, so 460 is greater.
460 > 430. The sign > means greater than.
Picture: A number line from 400 to 500 with a tick every 10. A dot at 430 labelled "Mei" and a dot at 460 labelled "Sam".
Your turn: Here are three numbers made with base 10 blocks. Which shows the greatest number?
Choose one:
The answer: Base 10 blocks showing 583: 5 hundreds, 8 tens and 3 ones.
5 hundreds, 8 tens and 3 ones make 583. That is the greatest.
Kofi has 280, Priya has 310 and Zara has 340. Let's order them, smallest first.
Compare the hundreds first. 280 has only 2 hundreds, so it is the smallest.
310 and 340 both have 3 hundreds, so compare the tens. 1 ten is less than 4 tens.
Smallest first: 280, 310, 340.
Picture: A number line from 250 to 350 with a tick every 10. A dot at 280 labelled "Kofi", a dot at 310 labelled "Priya" and a dot at 340 labelled "Zara".
Your turn: Put these numbers in order, smallest first. Compare the hundreds first. If they match, compare the tens.
Put in order:
The answer: 298, 309, 390
298, 309, 390. 298 has only 2 hundreds. 309 has 0 tens, so it is less than 390.
Let's find 10 more than 346. Start at 346.
Jump on 10. We land on 356.
346 + 10 = 356
Only the tens digit changed: 346 became 356.
Picture: A number line from 340 to 360, labelled every 2. A dot at 346 labelled "start". The frog hops from 346 to 356 (+10).
Now 100 less than 520. Start at 520.
Jump back 100. We land on 420.
520 − 100 = 420
Only the hundreds digit changed: 520 became 420.
Picture: A number line from 400 to 600 with a tick every 10, labelled every 20. A dot at 520 labelled "start". The frog hops from 520 to 420 (−100).
Your turn: Here is 472 made with base 10 blocks. What is 10 more than 472?
Picture: Base 10 blocks with 4 hundreds, 7 tens and 2 ones.
Type a number.
The answer: 482
482. One more ten makes 8 tens. 472 + 10 = 482
Picture: Base 10 blocks showing 482: 4 hundreds, 8 tens and 2 ones. The tens column is highlighted.
Hundreds, tens and ones. Read them from the left, compare the hundreds first, and change one digit for 10 or 100 more.
Let's go slowly, with place value counters.
2 hundred counters make 200.
1 ten counter makes 10, and 3 one counters make 3.
200, 10 and 3 make 213.
Picture: Place value counters showing 213: 2 hundreds, 1 ten and 3 ones.
Your turn: Count the counters: hundreds first, then tens, then ones. What number do they show?
Picture: Place value counters with 3 hundreds, 4 tens and 1 one.
Type a number.
The answer: 341
341. 3 hundreds, 4 tens and 1 one make 341.
Picture: Place value counters showing 341: 3 hundreds, 4 tens and 1 one. It is split into 300, 40 and 1.
10 more is one jump of 10 along the line. Start at 240.
One jump of 10 lands on 250.
240 + 10 = 250
Picture: A number line from 200 to 300 with a tick every 10. A dot at 240 labelled "start". The frog hops from 240 to 250 (+10).
Your turn: Start at 530. What is 10 more than 530?
Picture: A number line from 500 to 600 with a tick every 10. A dot at 530 labelled "start".
Type a number.
The answer: 540
540. One jump of 10 from 530 lands on 540.
Picture: A number line from 500 to 600 with a tick every 10. A dot at 530 labelled "start". The frog hops from 530 to 540 (+10).
Leila has 230 and Jonah has 270. Both have 2 hundreds.
The hundreds match, so compare the tens. 3 tens is less than 7 tens.
270 is greater than 230. It is further along the line.
Picture: A number line from 200 to 300 with a tick every 10. A dot at 230 labelled "Leila" and a dot at 270 labelled "Jonah".
Your turn: Which number is greater: 257 or 275?
Choose one:
Write the digits 0 to 9 on ten cards. Pick three and lay them out as a 3-digit number. Read it aloud together with 'and' (four hundred and twelve), then ask what each digit is worth. Shuffle the same three cards to make the biggest and smallest numbers you can. Finish by asking for 10 more and 100 more, and change just one card each time.
The answer: 275
275 is greater. 7 tens is more than 5 tens.
Hundreds first, then tens, then ones. 10 more is one jump of 10.