Cogito
Grade 4 Math · Chapter 1 · Lesson 4
Rounding to Any Place
Same rule, whichever place you are asked for.
10 problems · about 14 minutes · 4.NBT.A.3
What this lesson teaches
The child rounds a multi-digit number to any named place.
- Rounding works the same way at any place.
- Find the two neighbours, find halfway, pick a side.
- The same number rounds differently at different places.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
2 problemsReview — Comparing Large Numbers: Which is bigger, 32,450 or 32,405?
Answer 32450
Why 5 tens beats 0 tens.
Review — Reading and Writing Large Numbers: 60,000 + 700 + 8 in digits?
Answer 60708
Why 60,708.
Warm Up
Straightforward practice. Get the method working first.
4 problemsRound 6,349 to the nearest hundred.
Answer 6300
Why 6,349 is just before halfway.
Does one number always round to the same answer?
Answer No. It depends which place you round to.
Why The place you are asked for changes the answer.
Round 2,748 to the nearest ten.
Answer 2750
Why Halfway is 2,745.
Round 2,748 to the nearest hundred.
Answer 2700
Why Halfway is 2,750.
Build It Up
The same ideas with more to keep track of.
2 problemsRound 2,748 to the nearest thousand.
Answer 3000
Why Halfway is 2,500.
Round 15,600 to the nearest thousand.
Answer 16000
Why Halfway is 15,500.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsThe Crowd: Round 3,482 to the nearest hundred.
Answer 3500
Why 3,482 is past halfway, so it rounds to 3,500.
To the Thousand: Round 3,482 to the nearest thousand.
Answer 3000
Why 3,482 is before halfway, so it rounds to 3,000.