3rd Grade Common Core Math Worksheets - Free Printable

Let’s go through each problem one by one. We’re rounding to the nearest 10 using number lines. The rule is: if the ones digit is 5 or more, round up. If it’s less than 5, round down.

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Problem 1: 72

- Look at the number line between 70 and 80.
- 72 is closer to 70 than to 80? Let’s check:
- Distance from 72 to 70 = 2
- Distance from 72 to 80 = 8
→ So, 72 rounds to 70

Wait — but in the answer key it says 70 for #1? Actually, let me double-check the image description… Oh! In the user’s image, problem 1 shows 72 on a number line from 70 to 80, and the red dot is near 70 — so yes, 72 → 70.

But wait — actually, looking again: 72 is only 2 away from 70, and 8 away from 80 — so definitely 70.

BUT — hold on! I think I made a mistake here. Let me re-read the problems carefully.

Actually, let’s list all problems with their numbers:

From the image (as described):

1) 72 → between 70 and 80 → 72 is closer to 70 → 70

2) 23 → between 20 and 30 → 23 is 3 away from 20, 7 away from 30 → 20

3) 63 → between 60 and 70 → 63 is 3 away from 60, 7 away from 70 → 60

4) 377 → between 370 and 380 → 377 is 7 away from 370, 3 away from 380 → so closer to 380 → 380

5) 223 → between 220 and 230 → 223 is 3 away from 220, 7 away from 230 → 220

6) 916 → between 910 and 920 → 916 is 6 away from 910, 4 away from 920 → wait, 916 - 910 = 6; 920 - 916 = 4 → so closer to 920 → 920

7) 341 → between 340 and 350 → 341 is 1 away from 340, 9 away from 350 → 340

8) 3,935 → between 3,930 and 3,940 → 3,935 is exactly halfway? Wait — 3,935 - 3,930 = 5; 3,940 - 3,935 = 5 → when it’s exactly 5, we round UP → so 3,940

9) 8,922 → between 8,920 and 8,930 → 8,922 is 2 away from 8,920, 8 away from 8,930 → 8,920

Wait — but in the answer key shown in the image, #9 is 8920? Yes.

But let me verify each against standard rounding rules:

Rounding to nearest 10: look at the ones digit.

1) 72 → ones digit is 2 → less than 5 → round down → 70 ✔

2) 23 → ones digit 3 → <5 → 20 ✔

3) 63 → ones digit 3 → <5 → 60 ✔

4) 377 → ones digit 7 → ≥5 → round up → 380 ✔

5) 223 → ones digit 3 → <5 → 220 ✔

6) 916 → ones digit 6 → ≥5 → round up → 920 ✔

7) 341 → ones digit 1 → <5 → 340 ✔

8) 3935 → ones digit 5 → ≥5 → round up → 3940 ✔

9) 8922 → ones digit 2 → <5 → 8920 ✔

All match the answer key.

So final answers are:

1) 70
2) 20
3) 60
4) 380
5) 220
6) 920
7) 340
8) 3940
9) 8920

Final Answer:
70, 20, 60, 380, 220, 920, 340, 3940, 8920