Find here many important 3rd grade math concepts taught in 3rd grade. Teachers, parents, and math tutors can also use them as a guideline to illustrate a math lesson or to teach important skills that kids are supposed to know in 3rd grade math.

 SegmentA segment is a portion of a line and it has 2 endpoints.

 Identity property of addition 5 + 0 = 5                       2 + 0 = 2
 Identity property of addition 5 + 0 = 5      2 + 0 = 2

 Parallel linesParallel lines never meet

 1 inch1 inch is about the size of a quarter.1 foot = 12 inches
 Division12  ÷  3Make 3 equal groups with 12. The number of balls in each group is the answer.

 Gram/ kilogram1 gram is about the mass of 1 paperclip1000 grams  = 1 kgAbout 1000 paperclips will be equivalent to 1 kg. 1 large book could also have a mass of 1 kg

 Expanded formThe expanded form shows the place value of each digit. 478 = 400  + 70 + 8
 DivisorThe number that is used to divide

 FactorsA factor is a number that is multiplied by one or more numbers.

 AreaThe amount of space inside a 2-dimensional object.

 Word form of numbers 24652 is read twenty four thousand, six hundred fifty-two

 Commutative property of multiplication6 × 2 = 2 × 6

 Identity property of multiplication 5 × 1 = 5                       2 × 1 = 2
 Identity property of multiplication 5 × 1 = 52 × 1 = 2
 Commutative property of addition.1  + 2   =   2 + 1               =     3

 PerimeterPerimeter = 2 cm + 2 cm + 4 cm + 3 cm                  = 4 cm + 4 cm + 3 cm                  = 8 cm + 3 cm                  = 11 cm

 Fact familyA group of 3 numbers that are related in a special way. Doing math with 2 numbers always give the last number.

 Pattern:What is the next shape? ☺ ♥  ♥  ♦ ☺♥
 Pattern:What is the next shape? ☺ ♥  ♥  ♦ ☺♥

 PentagonA figure that has 5 sides

 DividendThe number that will be divided

 PointA point is an exact location on a piece of paper represented with a single dot •

 Standard formBase 10 numeration system or the usual way of writing numbers 24577

 Unit fractionA fraction whose numerator is equal to 1. The denominator can be equal to any number.

 Round a number28 is closer to 30, so the nearest 10 is 30.28 rounded to the nearest 10 is 30

 ProductThe answer to a multiplication problem.

 FractionTake 1 rectangle out of 4. The fraction is 1/4.

 QuotientThe answer to the division problem
 EvaluateFind the value of an expression Evaluate 2n + 5 when n = 3                   2 × 3 + 5 =  6 + 5 = 11
 EvaluateFind the value of an expression Evaluate 2n + 5 when n = 32 × 3 + 5 =  6 + 5 = 11
 Equivalent fractions

 Order of operations

 Three fourthsThe circle has 4 parts. 3 parts of the circle are shaded. The numerator is 3 and the denominator is 4.
 Algorithm for adding 28 and 14

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## Recent Articles

1. ### Number Game

Dec 01, 16 06:27 AM

1. Think of any positive whole number. No fractions, no decimals,no percents. 2. Double that number. 3. Add 10 to that result in step 2. 4. Divide