OST Grade 3 Math case studies
OST Grade 3 Math · Put your knowledge to work in context.
Ohio's State Tests (OST) Grade 3 Mathematics is the state mathematics assessment Ohio students take in third grade, one of the Ohio's State Tests administered by the Ohio Department of Education and Workforce. This page is an independent study resource for families, tutors, and educators preparing for that assessment; it is not affiliated with, endorsed by, or operated by the Ohio Department of Education and Workforce. The test samples the five Grade 3 mathematics domains: Operations and Algebraic Thinking; Number and Operations in Base Ten; Number and Operations-Fractions; Measurement and Data; and Geometry. Items appear as multiple choice, constructed response, and technology-enhanced formats, so preparation should mix fluency practice with written explanation and on-screen interaction. The OST Grade 3 Math case studies are 5 cases and about 2,935 words.
1Splitting a Factor but Adding the Part
Ortega's third graders turned in exit tickets for 7 × 8. Devon wrote 7 × 5 = 35, then 35 + 3 = 38, explaining, 'I split the 8 into 5 and 3 and add.' His earlier ticket shows 6 × 9 = 6 × 5 + 4 = 34.
652 words, about 3 min2Regrouping Across a Zero
Bell's third graders are working toward fluent subtraction within 1,000. The day's problem was 503 − 268.
581 words, about 3 min3Comparing Fractions with Different-Size Parts
Ibarra's class is comparing 3/4 and 5/8. On a quick check she reads three responses.
585 words, about 3 min4Elapsed Time and a Scaled Picture Graph
Chen's third grade is finishing the measurement unit. Friday's quiz had two items.
568 words, about 3 min5Area and Perimeter in a Garden Design
Patel gives pairs a design task: draw a rectangle on grid paper with an area of 24 square feet and a perimeter of 20 feet, where each grid square is 1 square foot. Rosa draws a 6-by-4 rectangle: 24 squares inside and 20 unit segments around.
549 words, about 3 min