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Number Trail Grade 3 / Week 01 / Monday
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Week 01 · Round, add and subtract

Monday

Round to the nearest ten
// Place value up to 1,000
⏱ about 15 min

Monday: Round to the nearest ten

Bennie the Bear sets a big basket of stones on a tree stump.

Riley the Raccoon peeks inside. "How many stones are in there?"

Bennie checks his notebook. "I counted 347 stones this morning."

"That is a lot to say," Riley laughs.

"Is it about 340 or about 350?"

"Let us find out together," says Bennie.

"We will round to the nearest ten on a number line."

Learn it: find the two tens

To round, first find the two tens a number sits between.

347 sits between 340 and 350.

Look at the ones digit. In 347, it is 7.

A number line from 340 to 350, with a dot at 347

On the number line, 347 is closer to 350.

So 347 rounds to 350.

The middle number, 345, is just as close to both tens.

We agree that a number in the middle rounds up.

So a ones digit of 5 or more rounds up. Less than 5 rounds down.

WHICH TWO TENS?
  • Read the question.
  • Tap your answer.
62 sits between which two tens?
347 sits between which two tens?
518 sits between which two tens?
785 sits between which two tens?
ROUND TO THE NEAREST TEN
  • Read the question.
  • Tap your answer.
A number line from 340 to 350, with a dot at 347Round 347 to the nearest ten.
A number line from 60 to 70, with a dot at 62Round 62 to the nearest ten.
Round 518 to the nearest ten.
Round 785 to the nearest ten.
UP OR DOWN?
  • Read the question.
  • Tap your answer.
Does 734 round up or down to the nearest ten?
Does 296 round up or down to the nearest ten?
Which number rounds to 350?
Riley counts 296 puzzle pieces. Round that to the nearest ten.
SentenceTrue or false?
56 rounds to 60.?
143 rounds to 150.?
625 rounds to 630.?
908 rounds to 900.?
WHY THIS EXERCISE143 rounds to 140, because 3 is less than 5.
ROUND 347 TO THE NEAREST TEN
  • Think about how Bennie rounds.
  • Tap the steps in order.
1First
2Next
3Then
4Last
Try it
Find a book with more than 100 pages.
Open it to any page and read the page number.
Say which two tens the number sits between.
Round it to the nearest ten.
On paper, make a number line from 120 to 130. Mark 127 and round it.

Great rounding! Tomorrow we round to the nearest hundred.