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Missouri Standards

Missouri 3rd Grade Math Standards

All 42 Missouri math standards for 3rd grade, each explained in plain English. The official wording is in Missouri Department of Elementary and Secondary Education's document, linked at the end of this page.

42 standards

Number Sense and Operations in Base Ten

4 standards
3.NBT.A.1
Round any whole number to the nearest ten or hundred, like 347 to 350 or to 300.
3.NBT.A.2
Read, write and recognize whole numbers up to 100,000 as digits, in words and in expanded form, like 40,512 = 40,000 + 500 + 10 + 2.
3.NBT.A.3
Add and subtract within 1,000 quickly and accurately, like 527 plus 286 or 900 minus 348.
3.NBT.A.4
Multiply a whole number by a multiple of ten from 10 to 90, like 7 times 30 is 210.

Number Sense and Operations in Fractions

7 standards
3.NF.A.1
Know that a unit fraction, like one fourth, is the size of a single piece when a whole is cut into equal pieces.
3.NF.A.2
Use a fraction to name part of an equally split whole, explaining the denominator as the pieces in the whole and the numerator as the pieces being counted.
3.NF.A.3
Place fractions on a number line by treating 0 to 1 as the whole, splitting it into equal parts, and marking the point that many parts from 0.
3.NF.A.4
Show that two fractions are equal when they are the same size or land on the same point of a number line, like 1/2 and 2/4.
3.NF.A.5
Find and recognize equivalent fractions with drawings or fraction strips and explain why they are equal, like 2/3 and 4/6.
3.NF.A.6
Compare two fractions with the same top or bottom number, record the result with a comparison symbol, and explain why, like 3/8 is less than 5/8.
3.NF.A.7
Explain why two fractions can only be compared when they are parts of the same size whole, like half a pizza versus half a cupcake.

Relationships and Algebraic Thinking

11 standards
3.RA.A.1
Explain what a product of whole numbers means, like 5 times 7 as the total in 5 groups of 7 objects.
3.RA.A.2
Explain what a quotient of whole numbers means, like 56 divided by 8 as the number in each of 8 equal shares.
3.RA.A.3
Describe a situation in words or pictures that shows multiplication or division, like sharing 12 cookies among 3 friends.
3.RA.A.4
Solve word problems using multiplication and division within 100, like finding how many rows of 6 chairs make 42 seats.
3.RA.A.5
Find the missing number in a multiplication or division equation with three whole numbers, like 8 times what equals 48.
3.RA.B.6
Use rules like order, grouping and the distributive property as shortcuts to multiply and divide, like finding 8 times 7 as 8 times 5 plus 8 times 2.
3.RA.C.7
Multiply and divide with numbers up to 100 by using how multiplication and division connect or using properties, and recall every product of two one-digit numbers.
3.RA.C.8
Multiply quickly and accurately with products up to 100, like knowing 6 times 8 is 48 and 9 times 7 is 63.
3.RA.D.9
Write and solve two-step word problems with addition, subtraction, multiplication or division, using a letter for the unknown amount.
3.RA.D.10
Judge whether an answer makes sense using mental math and estimation, including rounding, like rounding 298 plus 412 to check the sum is near 700.
3.RA.E.11
Spot number patterns in addition or multiplication tables and explain them using properties of operations, like why 4 times any number is even.

Geometry and Measurement

16 standards
3.GM.A.1
Know that shapes from different groups can share features, like four sides, and that a shared feature can name a bigger group, such as quadrilaterals.
3.GM.A.2
Recognize rhombuses and rectangles as kinds of quadrilaterals, and draw quadrilaterals that are neither, like a trapezoid.
3.GM.A.3
Divide a shape into pieces of equal area and name each piece's area as a unit fraction, like each of 6 equal parts is 1/6 of the shape.
3.GM.B.4
Read clocks and write the time to the closest minute, like 7:52.
3.GM.B.5
Estimate how many minutes something takes, like about 20 minutes for lunch or 5 minutes to walk to the office.
3.GM.B.6
Solve word problems that add and subtract minutes, like finding when recess ends if it starts at 10:15 and lasts 25 minutes.
3.GM.B.7
Measure or estimate the length, weight and liquid volume of objects, like a pencil in inches or a jug in liters.
3.GM.B.8
Use addition, subtraction, multiplication or division to solve word problems about lengths, liquid volumes or weights in the same unit.
3.GM.C.9
Find the area of a flat shape by covering it with unit squares, leaving no gaps or overlaps, and counting them.
3.GM.C.10
Write area measurements with square units, like square inches, square feet or square centimeters.
3.GM.C.11
Show that covering a rectangle with unit squares and multiplying its length by its width give the same area.
3.GM.C.12
Find the area of rectangles by multiplying whole-number side lengths in real problems, like a rug that is 6 feet by 8 feet.
3.GM.C.13
Find all the rectangles that can be made with a given area, like 12 squares as 1 by 12, 2 by 6 or 3 by 4.
3.GM.C.14
Split a rectangle into smaller rectangles and add their areas to find the area of the whole rectangle.
3.GM.D.15
Solve problems about the perimeter of polygons, like finding the distance around a garden or a missing side length.
3.GM.D.16
Show with examples that rectangles with the same perimeter can have different areas, and the same area can come with different perimeters.

Data and Statistics

4 standards
3.DS.A.1
Make frequency tables, scaled picture graphs and scaled bar graphs for data with several categories, like a picture graph where each icon stands for 5.
3.DS.A.2
Answer one-step and two-step questions using bar graphs or picture graphs, like how many more students chose soccer than tennis.
3.DS.A.3
Make a line plot to show a set of data, like the heights of class plants in inches.
3.DS.A.4
Read a line plot to answer questions about the data, like how many plants grew more than 3 inches.

The official Missouri documents

The plain-English lines on this page are EMStudio's own explanations of Missouri's standards, not the official wording, which Missouri Department of Elementary and Secondary Education publishes in the documents above. Codes and strand names identify each standard.