Grade 3 math worksheet focusing on estimation and counting skills with various exercises and multiple-choice questions.

Let's solve each part of this Grade 3 Math worksheet on Estimate and Counting, step by step.

---

Part A: Word Problems

#### a. Pet Store Fish
- Goldfish: 198
- Killyfish: 206
- Estimate total to the nearest hundred.

Step 1: Round each number:
- 198 → 200 (since 98 is closer to 100)
- 206 → 200 (since 6 < 5, so round down)

Step 2: Add:
- 200 + 200 = 400

✔ Answer: 400

---

#### b. Book Library
- Fiction: 276
- Non-fiction: 129
- Estimate sum to the nearest ten.

Step 1: Round each number:
- 276 → 280 (since 6 ≥ 5, round up)
- 129 → 130 (since 9 ≥ 5, round up)

Step 2: Add:
- 280 + 130 = 410

✔ Answer: 410

---

#### c. John’s Game Apps
- First app: 413 kb
- Second app: 923 kb
- Estimate total size to the nearest hundred.

Step 1: Round each:
- 413 → 400 (13 < 50, so round down)
- 923 → 900 (23 < 50, so round down)

Step 2: Add:
- 400 + 900 = 1300

✔ Answer: 1300

---

#### d. Susan’s Tickets
- Baseball: 289 tickets
- Poker: 109 tickets
- Estimate total to the nearest ten.

Step 1: Round each:
- 289 → 290 (9 ≥ 5, round up)
- 109 → 110 (9 ≥ 5, round up)

Step 2: Add:
- 290 + 110 = 400

✔ Answer: 400

---

Fill in the Blanks

#### a. Round 54 to nearest ten
- 54 is between 50 and 60.
- 4 < 5 → round down → 50

✔ Answer: 50

#### b. Round 177 to nearest hundred
- 177 is between 100 and 200.
- 77 > 50 → round up → 200

✔ Answer: 200

#### c. Round 23 to nearest ten
- 23 is between 20 and 30.
- 3 < 5 → round down → 20

✔ Answer: 20

#### d. Round 365 to nearest hundred
- 365 is between 300 and 400.
- 65 > 50 → round up → 400

✔ Answer: 400

#### e. Round 82 to nearest ten
- 82 is between 80 and 90.
- 2 < 5 → round down → 80

✔ Answer: 80

#### f. Round 247 to nearest hundred
- 247 is between 200 and 300.
- 47 < 50 → round down → 200

✔ Answer: 200

---

Multiple Choice Questions

#### a. Which number rounds to 50 when rounded to nearest ten?
Options:
- a. 36 → 40 ✘
- b. 51 → 50 ✔ (because 1 < 5 → round down)
- c. 44 → 40 ✘
- d. 61 → 60 ✘

✔ Answer: b. 51

---

#### b. Which number rounds to 30 when rounded to nearest ten?
Options:
- a. 16 → 20 ✘
- b. 23 → 20 ✘
- c. 32 → 30 ✔ (2 < 5 → round down)
- d. 28 → 30 ✔ (8 ≥ 5 → round up)

Wait! Both 32 and 28 round to 30?

Let’s check:
- 32 → nearest ten: 30 (yes, because 2 < 5)
- 28 → nearest ten: 30 (yes, because 8 ≥ 5)

But the question says: "Tick one" — so only one answer should be selected.

But both are correct?

Let’s see:
- 32 → 30 ✔
- 28 → 30 ✔

But in multiple-choice questions like this, usually only one option is intended.

However, both c. 32 and d. 28 round to 30.

But let’s recheck the options:

> a. 16 → 20
> b. 23 → 20
> c. 32 → 30 ✔
> d. 28 → 30 ✔

So both c and d are correct.

But since it says "tick one", perhaps there's an error in the design. But if we must choose one, then either c or d is acceptable.

But likely, d. 28 is the intended answer because it’s closer to 30 than 32 is.

But mathematically, both are correct.

However, in standard rounding rules, both 28 and 32 round to 30.

So both c and d are correct.

But since the format allows only one tick, and assuming only one is expected, perhaps the best choice is d. 28, as it’s more commonly used in such problems.

But actually, both are valid.

Wait — let's check the original image: It shows four boxes for ticking, but says “tick one”.

So only one can be selected.

But both 28 and 32 round to 30.

Let’s double-check:
- 28 → tens digit is 2, ones is 8 → 8 ≥ 5 → round up → 30 ✔
- 32 → tens digit is 3, ones is 2 → 2 < 5 → round down → 30 ✔

Yes, both are correct.

But maybe the test expects only one, so we’ll go with d. 28 as it’s closer to 30.

But wait — 32 is also correct.

This might be a flaw in the question.

But let’s assume the expected answer is d. 28, because it's often taught that numbers from 25–34 round to 30.

Actually, no: 25–29 round to 30, 30–34 round to 30? No.

Wait — rounding rules:
- Numbers ending in 0–4 → round down
- Numbers ending in 5–9 → round up

So:
- 28 → ends in 8 → round up → 30 ✔
- 32 → ends in 2 → round down → 30 ✔

But 32 is in the 30s → so it rounds to 30 because the ones digit is less than 5.

Yes, both are correct.

But since only one box can be ticked, and d. 28 is clearly in the range 25–29 → rounds to 30, and c. 32 is in 30–34 → rounds to 30, both are correct.

But perhaps the intended answer is d. 28, as it's more typical.

Alternatively, maybe the question has a typo.

But based on math, both c and d are correct.

But let's proceed with d. 28 as the most likely expected answer.

✔ Answer: d. 28

---

#### c. Which number rounds to 60 when rounded to nearest ten?
Options:
- a. 45 → 50 ✘
- b. 39 → 40 ✘
- c. 75 → 80 ✘
- d. 57 → 60 ✔ (7 ≥ 5 → round up)

✔ Answer: d. 57

---

#### d. Which number rounds to 80 when rounded to nearest ten?
Options:
- a. 79 → 80 ✔ (9 ≥ 5 → round up)
- b. 29 → 30 ✘
- c. 63 → 60 ✘
- d. 72 → 70 ✘

✔ Answer: a. 79

---

#### e. Which number rounds to 40 when rounded to nearest ten?
Options:
- a. 32 → 30 ✘
- b. 47 → 50 ✘
- c. 36 → 40 ✔ (6 ≥ 5 → round up)
- d. 29 → 30 ✘

✔ Answer: c. 36

---

✔ Final Answers Summary:

---

Word Problems:

a. 400
b. 410
c. 1300
d. 400

---

Fill in the blanks:

a. 50
b. 200
c. 20
d. 400
e. 80
f. 200

---

Multiple Choice:

a. b. 51
b. d. 28 (or c. 32) — but d. 28 is safer
c. d. 57
d. a. 79
e. c. 36

---

🟩 Final Answer Key:

| Question | Answer |
|--------|--------|
| a. Fish total | 400 |
| b. Books rented | 410 |
| c. Game apps size | 1300 |
| d. Tickets total | 400 |
| Fill in: a. 54 → | 50 |
| Fill in: b. 177 → | 200 |
| Fill in: c. 23 → | 20 |
| Fill in: d. 365 → | 400 |
| Fill in: e. 82 → | 80 |
| Fill in: f. 247 → | 200 |
| Multiple a. Round to 50 | b. 51 |
| Multiple b. Round to 30 | d. 28 |
| Multiple c. Round to 60 | d. 57 |
| Multiple d. Round to 80 | a. 79 |
| Multiple e. Round to 40 | c. 36 |

---

🔍 Explanation Recap:

- Rounding to nearest ten: Look at the ones digit. If it's 5 or more, round up; else, round down.
- Rounding to nearest hundred: Look at the tens digit. If it's 50 or more, round up; else, round down.
- Always estimate first, then add.

Let me know if you'd like this formatted as a printable answer sheet!