FREE 3rd Grade OST Math Practice Test

6 South Carolina SC READY Grade 3 Math Practice Tests

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For this practice test, we’ve selected 20 real questions from past exams for your student’s OST Practice test. Your student will have the chance to try out the most common OST Math questions. For every question, there is an in-depth explanation of how to solve the question and how to avoid mistakes next time.

Use our free OST Math practice tests and study resources (updated for 2026) to help your students ace the OST Math test! Make sure to follow some of the related links at the bottom of this post to get a better idea of what kind of mathematics questions students need to practice.

10 Sample 3rd Grade OST Math Practice Questions

1- There are 6 numbers in the box below. Which of the following list shows only even numbers from the numbers in the box?

A. \(15, 29, 42\)

B. \(15, 29, 83\)

C. \(15, 30, 42\)

D. \(42, 18, 30\)

2- Noah packs 18 boxes with crayons. Each box holds 40 crayons. How many crayons Noah can pack into these boxes?

A. 480

B. 540

C. 680

D. 720

3- A cafeteria menu had spaghetti with meatballs for $10 and bean soup for $6. How much would it cost to buy three plates of spaghetti with meatballs and two bowls of bean soup? __________

4- Which number correctly completes the number sentence \(25 × 50 =\)?

A. 225

B. 900

C. 1250

D. 2250

5- Michael has 745 marbles. What is this number rounded to the nearest ten? ____________

6- There are 60 minutes in an hour. How many minutes are in 6 hours?

A. 300 minutes

B. 320 minutes

C. 360 minutes

D. 400 minutes

7- Which number correctly completes the number sentence \(55 × 14 =\)?

A. 550

B. 660

C. 770

D. 990

8- Use the picture below to answer the question.

Which fraction shows the shaded part of this square?

A. \(\frac{88}{100}\)

B. \(\frac{88}{10}\)

C. \(\frac{8.8}{100}\)

D. \(\frac{8}{100}\)

9- What number makes this equation true?
\(12 × 8 = ⎕\)

A. 88

B. 96

C. 100

D. 108

10- Kayla has 109 red cards and 88 white cards. How many more red cards than white cards does Kayla have?

A. 17

B. 19

C. 21

D. 27

11- A number sentence is shown below.
\(3 × 7 \space ⎕ \space 6 = 126\)
What symbol goes into the box to make the number sentence true?

A. \(×\)

B. \(÷\)

C. \(+\)

D. \(-\)

12- Liam had 845 marbles. Then, he gave 455 of the cards to his friend Ethan. After that, Liam lost 116 cards.
Which equation can be used to find the number of cards Liam has now?

A. \(845 – 455 + 116 = \)

B. \(845 – 455 – 116 =\)

C. \(845 + 455 + 116 = \)

D. \(845 + 455 – 116 = \)

13- What is the value of “B” in the following equation?
\(33 + B + 8 = 66\)

A. 16

B. 18

C. 22

D. 25

14- Mason is 18 months now and he usually eats six meals a day. How many meals does he eat in a week?

A. 36

B. 40

C. 42

D. 48

15- Which of the following list shows only fractions that are equivalent to \(\frac{1}{3}\)?

A. \(\frac{3}{9},\frac{5}{15},\frac{24}{72}\)

B. \(\frac{6}{12},\frac{5}{15},\frac{9}{27}\)

C. \(\frac{3}{9},\frac{4}{15},\frac{6}{18}\)

D. \(\frac{3}{9},\frac{5}{10},\frac{8}{24}\)

16- What mixed number is shown by the shaded rectangles?

A. \(3\frac{1}{2}\)

B. \(4\frac{1}{2}\)

C. 3

D. 4

17- The perimeter of a square is 24 units. Each side of this square is the same length.
What is the length of one side of the square in units?

A. 4

B. 5

C. 6

D. 7

18- There are two different cards on the table.
There are 3 rows that have 13 red cards in each row.
There are 24 white cards.
How many cards are there on the table?

A. 59

B. 63

C. 68

D. 70

19- Which of the following comparison of fractions is true?

A. \(\frac{2}{5}=\frac{4}{10}\)

B. \(\frac{2}{5}> \frac{4}{10}\)

C.\(\frac{2}{5}< \frac{4}{10}\)

D. \(\frac{2}{5}< \frac{2}{10}\)

20- What is the value of \(A\) in the equation \(64 ÷ A = 8\)

A. 2

B. 4

C. 6

D. 8

Best 3rd Grade OST Math Prep Resource for 2026

Answers:

2- D
\(18 × 40 = 720\)

3- 42
3spaghetti with meatballs cost: \(3 × $10 = $30\)
2bowls of bean soup cost: \(2 × $6 = $12\)
3spaghetti with meatballs \(+\) 2bowls of bean soup cost: \($30 + $ 12 = $42\)

4- C
\(25 × 50 = 1250\)

5- 750
We round the number up to the nearest ten if the last digit in the number is 5, 6, 7, 8, or 9.
We round the number down to the nearest ten if the last digit in the number is 1, 2, 3, or 4.
If the last digit is 0, then we do not have to do any rounding, because it is already to the ten.
Therefore, rounded number of 745 to the nearest ten is 750.

6- C
\(1\) hour \(= 60\) minutes
\(6\) hours\( = 6 × 60\) minutes\(⇒ 6\) hours\( = 360\) minutes

7- C
\(55 × 14 = 770\)

8- A
The model for the fraction is divided into 100 equal parts. We shade 88 parts of these 100 parts that it’s equal to \(\frac{88}{100}\)

9- B
\(12 × 8 = 96\)

10- C
Subtract 109 red cards and 88 white cards. The answer is 21

11- A
\(3 × 7 \space ⎕ \space 6 = 126\)
\(21\space ⎕\space 6= 126 ⇒ 126=21×6\)

12- B
Liam gave 455 of his marbles to his friend that means his marbles decreased then he lost 116 of his marbles that means his marbles decreased again.

13- D
\(33 + B + 8 = 66 ⇒ 41+B =66 ⇒ B =66 – 41 =25\)

14- C
If he eats 6 meals in 1 day
So in a week (7 days) he eats \((7 × 6 = 42)\) meals.

15- A
All these fractions; \(\frac{3}{9},\frac{5}{15},\frac{24}{72}\) after simplification are equivalent to \(\frac{1}{3}\).

16- A
This shape shows 3 complete shaded triangles and a half of a triangle that is equal to \(3\frac{1}{2}\)

17- C
Perimeter of square formula \(= 4 ×\) side \(⇒ 24 = 4 ×\) side \(⇒\) side \(= 6\)

18- B
3 rows that have 13 red cards in each row means: \(3 × 13 = 39\) red cards
And there are 24 white cards on table too, so in total there are \(39 + 24 = 63\) cards on table

19- A
Simplify \(\frac{4}{10}\) that’s equal to \(\frac{2}{5}\)

20- D
\(64 ÷ 8 = 8\)

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The Best Books to Ace the 3rd Grade OST Math Test

Mastering Grade 3 Math The Ultimate Step by Step Guide to Acing 3rd Grade Math

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Recommended EffortlessMath Books

For a workbook that covers every grade 3 OST topic step by step, the Grade 3 Common Core Math Exercise Book walks through each standard with worked examples your child can follow. For more grade 3 practice tests, see the 6 Full-Length Grade 3 Math Practice Tests.

Frequently Asked Questions

How many questions are on the 3rd Grade OST Math test?

The Ohio State Test (OST) Grade 3 Math has about 40-45 items split across two parts (one calculator-inactive, one with technology-enhanced items). This free practice gives you 20 sample questions covering the same topics in one sitting.

Is a calculator allowed on the 3rd Grade OST Math?

No. Calculators are not permitted on the Grade 3 OST Math. The grade 3 content is designed to test computational fluency — addition, subtraction, multiplication, and division — without any tools. Practice fact fluency at home throughout the year.

How long is the 3rd Grade OST Math test?

Each of the two parts has a 75-minute time limit. Most third graders finish each part well within the time. Total testing time is about 2.5 hours across two sittings, usually scheduled on separate days during the spring window.

How is the OST Math scored?

Each grade gets a scale score and a performance level: Limited, Basic, Proficient, Accelerated, or Advanced. Ohio targets Proficient or above as the grade-level expectation. The score report also breaks down performance by reporting category (operations, fractions, measurement, geometry).

What topics are on the 3rd Grade OST Math?

Operations and algebraic thinking (multiplication and division within 100, word problems, patterns), number and operations in base ten (place value, rounding, multi-digit arithmetic), fractions (understanding, equivalence, comparison on a number line), measurement and data (time, mass, volume, area, perimeter, bar graphs), and geometry (shape attributes, partitioning).

Can my child retake the 3rd Grade OST Math?

The OST is given once per spring. There’s no individual retake within the year. Note: Ohio has a separate Third Grade Reading Guarantee for promotion, but the OST Math doesn’t have the same promotion rule — passing thresholds are set at the school level.

How long should we prepare for the 3rd Grade OST Math?

For most third graders, 4-6 weeks of practice at 15-20 minutes a day works well. If multiplication facts aren’t automatic yet, spend the first 2 weeks on fact fluency before adding word problems. Take this practice test first so you know which topics need the most work.

Is the OST aligned to Common Core?

Ohio adopted Common Core in 2010, then revised the standards and renamed them Ohio’s Learning Standards. The grade 3 math content still aligns closely with CCSS 3.OA, 3.NBT, 3.NF, 3.MD, and 3.G, with some Ohio-specific wording changes.

What’s the hardest part of the 3rd Grade OST Math for most kids?

Two common stumbling blocks: multi-step word problems with multiplication or division, and the technology-enhanced items (drag-and-drop, hot-spot). Both reward careful reading and a little practice with the testing platform before the real test day.

Where can I find more 3rd Grade OST practice?

EffortlessMath has lessons for every grade 3 Ohio’s Learning Standards math topic, plus the grade 3 Common Core workbook (which covers the same content) and additional full-length grade 3 practice tests.

Related EffortlessMath Lessons

If a topic on this page feels rusty, these short lessons go deeper:

• Multiply and divide by 10
• How to compare fractions
• Area and perimeter
• Place value
• How to round numbers