3rd Grade OST Math Practice Test Questions
TL;DR: Got a third grader prepping for the OST Math test in Ohio? These free practice questions cover the topics your child will see on Ohio’s State Test: multiplication and division, fractions, place value, area and perimeter, and word problems. Worked answers are included, so the two of you can sit down together and walk through the reasoning behind any misses step by step rather than just landing on the right answer.
Key takeaways:
- OST (Ohio’s State Tests) grade 3 Math has about 35-40 questions across two parts.
- Items include multiple choice, multi-select, drag-and-drop, equation editor, and short answer.
- No calculator at grade 3.
- Aligned with Ohio’s Learning Standards (which match Common Core for grade 3 math).
- Proficient (level 3 of 5) is the on-grade-level mark schools target.
A. Each shows the same fraction because they are the same size.
B. Each shows a different fraction because they are different shapes.
C. Each shows the same fraction because they both have 3 sections shaded.
D. Each shows a different fraction because they both have 3 shaded sections but a different number of total sections.
8- To what number is the arrow pointing?
A. 36
B. 38
C. 30
D. 42
9- Emily has 108 stickers and she wants to give them to nine of her closest friends. If she gives them all an equal number of stickers, how many stickers will each of Emily’s friends receive? ___________
10- The following models are the same size and each is divided into equal parts.
The models can be used to write two fractions.
Based on the models, which of the following statements is true?
A. \(\frac{2}{8}\) is bigger than \(\frac{4}{16}\).
B. \(\frac{2}{8}\) is smaller than \(\frac{4}{16}\).
C. \(\frac{2}{8}\) is equal to \(\frac{4}{16}\).
D. We cannot compare these two fractions only by using the models.
Best 3rd Grade OST Math Prep Resource for 2026
Answers:
1- A
\(8000 – 658 = 7342\)
2- D
\(14 × 40 = 560\)
3- D
24,589 is the sum of \(20,000; 4,000; 500; 80;\) and 9
4- C
\(A = 44 – (21 + 9)\)
\(A = 14\)
5- C
In 1 day 4 meals so \(4 × 7 = 28\) meals a week.
6- D
\(A = 72 ÷ 8\)
\(A= 9 \)
7- D
the model for the first fraction is divided into 6 equal parts. We shade 3_6 to show the same amount as 1_2. The model for the second fraction is divided into 8 equal parts. We shade 3_ 8 that it shows these two models are different fractions.
8- C
The arrow shows exactly the middle of two numbers 25 and 35, so the answer is 30.
9- 12
\(108 ÷ 9 = 12\)
10- C
the model for the first fraction is divided into 8 equal parts. We shade 2_ 8 to show the same amount as 1_ 4. The model for the second fraction is divided into 16 equal parts. We shade 4_ 16 to show the same amount as 1_ 4.
Looking for the best resource to help you succeed on the 3rd Grade OST Math test?
The Best Books to Ace the 3rd Grade OST Math Test
Recommended EffortlessMath Books
For a workbook your child can use alongside this practice test, Mastering Grade 3 Math walks through every grade 3 topic on the Ohio State Test with worked examples. For extra word-problem practice (heavy on the OST), see Mastering Grade 3 Math Word Problems.
Frequently Asked Questions
How many questions are on the 3rd grade OST Math test?
The grade 3 OST Math has about 35-40 questions split across two parts. Item types include multiple choice, multi-select (pick all that apply), drag-and-drop, equation editor, and short open-response items where your child types in a number or short answer.
Is a calculator allowed on the 3rd grade OST?
No. Calculators aren’t permitted on the grade 3 Ohio State Test. Your child needs multiplication facts through \(10\times 10\) memorized and should handle multi-digit addition, subtraction, multiplication, and division by hand.
When is the OST given in Ohio?
The grade 3 OST Math is given in two windows. The English Language Arts test is administered in fall and spring (the spring score counts for the third-grade reading guarantee). The math test is given in the spring only, typically in April or early May.
What’s a passing score on the 3rd grade OST Math?
Ohio reports five performance levels: Limited, Basic, Proficient, Accelerated, and Advanced. Proficient (level 3) is the on-grade-level target most schools use. The grade 3 retention rule is tied to reading, not math, so math levels alone don’t cause retention.
Can my child retake the OST?
No formal retake of the grade 3 math test. It’s given once per year. The spring score is the score of record. Low scores trigger extra classroom support the following year but don’t cause retention by themselves.
What math topics are on the 3rd grade OST?
Multiplication and division within 100, fractions on a number line and equivalent fractions, perimeter and area of rectangles, multi-digit place value (to 1,000), measurement (time to the minute, length, mass), money word problems, and reading bar and picture graphs.
How long should we study for the OST Math?
For a child working at grade level, 4-6 weeks at 15-20 minutes a day is enough. For a child who’s been struggling, plan 8-12 weeks at 25 minutes a day. Multiplication-fact fluency is the highest-impact thing to drill first.
How long does the actual test take?
Each part is about 70-85 minutes; most kids finish in 60-75. The two parts are usually given on consecutive school days, so total math testing is around 2.5 hours across two mornings.
Does the OST align with Common Core?
Ohio’s Learning Standards are Common Core-aligned for grade 3 math, with some Ohio-specific clarifications. The core topics – multiplication, fractions, area, place value – are identical to Common Core grade 3, so Common Core prep materials still match well.
Where can we find more OST Math practice?
EffortlessMath has the Mastering Grade 3 Math workbook covering every standard with worked examples, plus Mastering Grade 3 Math Word Problems for the constructed-response items where most third-graders lose points.
Related EffortlessMath Lessons
If a topic on this page feels rusty, these short lessons go deeper:
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