3rd grade math

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.

Segment

A 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 lines
Parallel lines never meet

Parallel lines


1 inch

1 inch is about the size of a quarter.

1 foot = 12 inches

1 inch

Division
12  ÷  3
Make 3 equal groups with 12. The number of balls in each group is the answer.

12 divided by 3


Gram/ kilogram

1 gram is about the mass of 1 paperclip
1000 grams  = 1 kg
About 1000 paperclips will be equivalent to 1 kg. 1 large book could also have a mass of 1 kg

mass of a paperclip is about 1 gram


Expanded form

The expanded form shows the place value of each digit. 


           478 = 400  + 70 + 8

Divisor

The number that is used to divide

Divisor


Factors

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

factors


Area

The amount of space inside a 2-dimensional object.



Word form of numbers

24652 is read twenty four thousand, six hundred fifty-two



Addition algorithm



Commutative property of multiplication

6 × 2 = 2 × 6

Commutative property of multiplication


Identity property of multiplication

                       5 × 1 = 5
                       2 × 1 = 2

Identity property of multiplication

× 1 = 5
2 × 1 = 2

Commutative property of addition.

1  + 2   =   2 + 1  
             =     3

Illustration of the commutative property




Perimeter

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

Perimeter of a trapezoid


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

Fact family


Pattern:

What is the next shape?


                 ☺ ♥  ♥  ♦ 

Pattern:

What is the next shape?

☺ ♥  ♥  ♦ 



Pentagon

A figure that has 5 sides

Pentagon



Dividend
The number that will be divided

Dividend


Point
A point is an exact location on a piece of paper represented with a single dot 

              •



Standard form
Base 10 numeration system or the usual way of writing numbers

           
              24577



Unit fraction

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

Unit fractions


Round a number

28 is closer to 30, so the nearest 10 is 30.
28 rounded to the nearest 10 is 30

Nearest 10 for 28


Product

The answer to a multiplication problem.



Fraction

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

1 out of 4


Quotient

The answer to the division problem

Quotient

Evaluate
Find the value of an expression

                  Evaluate 2n + 5 when n = 3

                   2 × 3 + 5 =  6 + 5 = 11     

Evaluate
Find the value of an expression

Evaluate 2n + 5 when n = 3

2 × 3 + 5 =  6 + 5 = 11    


Equivalent fractions

Equivalent fractions




Order of operations

Order of operations


Three fourths

The circle has 4 parts. 3 parts of the circle are shaded. The numerator is 3 and the denominator is 4.

Three fourths



Algorithm for adding 28 and 14

Algorithm for adding  28 and 14




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