Ohio Standards
Ohio 1st Grade Math Standards
All 21 Ohio math standards for 1st grade, each explained in plain English. The official wording is in Ohio Department of Education and Workforce's document, linked at the end of this page.
21 standards
Operations and Algebraic Thinking
8 standards1.OA.1
Solve word problems within 20 where things are added, taken away, joined, split apart, or compared, with the missing number anywhere, using objects, drawings, or equations.
1.OA.2
Solve word problems that add three whole numbers totaling 20 or less, like 4 + 7 + 6, using objects, drawings, or an equation with a box for the missing number.
1.OA.3
Use properties of operations to add and subtract more easily, like turning 8 + 3 around to 3 + 8, or adding 6 + 4 first to make ten in 2 + 6 + 4.
1.OA.4
Turn a subtraction problem into a missing-number addition, like finding 10 - 8 by asking what added to 8 makes 10.
1.OA.5
Use counting to add and subtract, like counting on two more to add 2 or counting back two to take away 2.
1.OA.6
Add and subtract within 20 with fluency within 10, using strategies such as counting on, making ten, and known facts, like 8 + 4 = 12 means 12 − 8 = 4.
1.OA.7
Know that the equal sign means both sides are the same amount, and tell whether equations like 7 = 8 - 1 or 4 + 1 = 5 + 2 are true or false.
1.OA.8
Find the missing number in an addition or subtraction equation with three numbers, like 8 + ? = 11 or 5 = ? - 3.
Number and Operations in Base Ten
6 standards1.NBT.1
Count to 120 starting from any number, and read, write and match numerals in that range to groups of objects.
1.NBT.2
Understand that the digits of a two-digit number stand for tens and ones, like 10 is a bundle of ten ones, 13 is a ten and 3 ones, and 40 is four tens.
1.NBT.3
Compare two two-digit numbers by looking at their tens first, then their ones, and record the answer with >, = or <.
1.NBT.4
Add within 100, like 34 + 5 or 34 + 20, with models, drawings, and place value, adding tens to tens and ones to ones, making a new ten when needed, and explain the steps.
1.NBT.5
Find 10 more or 10 less than any two-digit number in their head, like 47 + 10 = 57, without counting, and explain how they know.
1.NBT.6
Subtract tens from tens within 90, like 70 - 30 = 40, using models, drawings or place value, and explain the thinking.
Measurement and Data
4 standards1.MD.1
Put three objects in order from shortest to longest, and compare two objects by measuring each against a third one.
1.MD.2
Measure how long an object is by laying same-size units end to end with no gaps or overlaps, and give the length as a whole number, like 6 paper clips long.
1.MD.3
Read and write clock times to the hour and half hour on analog and digital clocks, and name pennies and dimes and what each is worth.
1.MD.4
Sort data into up to three groups, show it in a chart or picture, and answer how many in all, how many in each group, and how many more or fewer.
Geometry
3 standards1.G.1
Tell the features that define a shape, like a triangle's three sides, from features that do not, like color or size, and build and draw shapes that have them.
1.G.2
Put flat shapes like squares, triangles, and half circles, or solids like cubes and cones, together to make a new shape, then use it to build more shapes.
1.G.3
Cut circles and rectangles into 2 or 4 equal shares called halves, fourths, or quarters, see the whole as two halves or four fourths, and know more shares are smaller.
The official Ohio documents
- Ohio's Learning Standards: Mathematics · adopted February 2017 · current for 2026-27
The plain-English lines on this page are EMStudio's own explanations of Ohio's standards, not the official wording, which Ohio Department of Education and Workforce publishes in the documents above. Codes and strand names identify each standard.