Week 01 · Round, add and subtract
Tuesday
Round to the nearest hundred
// Place value up to 1,000
⏱ about 15 min
Tuesday: Round to the nearest hundred
Donnie the Deer walks softly down the trail beside Bennie.
"I counted my steps from the meadow to the pond," says Donnie.
"It was 462 steps."
Bennie nods. "That is about 460 steps, to the nearest ten."
Donnie tilts one ear. "Can we say it with hundreds?"
"Yes," says Bennie. "Let us round to the nearest hundred."
Learn it: find the two hundreds
462 sits between 400 and 500.
Now look at the tens digit. In 462, it is 6.
The middle is 450. A tens digit of 5 or more rounds up.
On the number line, 462 is closer to 500.
So 462 rounds to 500, to the nearest hundred.
A number can round two ways.
To the nearest ten, 462 rounds to 460.
To the nearest hundred, 462 rounds to 500.
WHICH TWO HUNDREDS?
- Read the question.
- Tap your answer.
462 sits between which two hundreds?
138 sits between which two hundreds?
709 sits between which two hundreds?
851 sits between which two hundreds?
ROUND TO THE NEAREST HUNDRED
- Read the question.
- Tap your answer.
Round 462 to the nearest hundred.
Round 138 to the nearest hundred.Round 750 to the nearest hundred.
Round 849 to the nearest hundred.
ROUND TWO WAYS
- Read the question.
- Tap your answer.
Round 738 to the nearest ten.
Round 738 to the nearest hundred.
Round 251 to the nearest ten.
Round 251 to the nearest hundred.
Look at the tens digit. 5 or more rounds up.
| Sentence | True or false? |
|---|---|
| 462 rounds to 500. | ? |
| 349 rounds to 400. | ? |
| 650 rounds to 700. | ? |
| 915 rounds to 900. | ? |
WHY THIS EXERCISE349 rounds to 300, because its tens digit is 4.
ORDER FROM LEAST TO GREATEST
- Look at the hundreds digit first.
- Tap the numbers from least to greatest.
11st
22nd
33rd
44th
Try it
Find a number from 100 to 999 at home.
It could be a page number or a number on a calendar.
Round it to the nearest hundred.
Then round it to the nearest ten.
It could be a page number or a number on a calendar.
Round it to the nearest hundred.
Then round it to the nearest ten.
◇ ROUND WITH A GROWN-UP
Your grown-up says a number from 100 to 999.
You round it to the nearest hundred.
Your grown-up checks with a number line on paper.
Switch jobs and play five rounds each.
You round it to the nearest hundred.
Your grown-up checks with a number line on paper.
Switch jobs and play five rounds each.
Wonderful work! Tomorrow we add numbers up to 1,000.