Second grade math

Find here many important second grade math concepts taught in second 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 second grade math.

Doubles

In doubles, both addends are the same.

         1 + 1 = 2                2 + 2 = 4
       3 + 3 = 6                4 + 4 = 8
       5 + 5 = 10             6 + 6 = 12




Decompose a number




Equal groups

Groups have the same number of items.

4 equal groups of 3


Estimate:

No need to get an exact answer.

Possible answer: 35, 40 or 30

         ♥ ♥        ♥ ♥
♥ ♥ ♥ ♥   ♥ ♥ ♥  ♥ ♥ ♥ ♥ ♥     ♥ ♥ ♥ ♥ ♥ ♥       ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥




a.m.

12:00 a.m. : midnight. sleeping time
7:30 a.m. : half past 7. wake up time
10:15 a.m.: a quarter after 10. doing work in class.



Example of angle.

When two lines meet at a common point, they make an angle.

Example of angle


Bar graph


A graph that uses rectangles to compare data. Saturday got 15 votes

Bar graph


Array

The array on the right is made with triangles. The array has 4 rows and 5 columns.  4 × 5 = 20 triangles

                              ▲ ▲ ▲ ▲ 
                          ▲ ▲ ▲ ▲ ▲
                          ▲ ▲ ▲ ▲ ▲
                          ▲ ▲ ▲ ▲ ▲

Array

The array on the right is made with triangles. The array has 4 rows and 5 columns.  4 × 5 = 20 triangles

     ▲ ▲ ▲ ▲ 
     ▲ ▲ ▲ ▲ ▲
     ▲ ▲ ▲ ▲ ▲
     ▲ ▲ ▲ ▲ ▲



Associative property

                   8 + 5 + 2     =    (8 + 5)  + 2
                                       =    8 + (5 + 2)         

Associative property

  8 + 5 + 2     =    (8 + 5)  + 2
                      =    8 + (5 + 2)



Even number

There are 10 balls and 10 is an even number. An even number has 2 equal parts. 10 has 2 equal parts. Each part is equal to 5.

Even number


Count back

7 - 4

                               ☺☺☺☺☺☺

                               ☺☺☺☺
                               
☺☺☺☺
                               
☺☺
                               
☺☺

Count back

7 - 4

☺☺☺☺☺☺

☺☺☺☺
☺☺☺☺
☺☺
☺☺



1 Dollar

1 dollar  = 100 cents

1 us dollar



Number line

Portion of a number line


Word form of number

            345: three hundred, forty-five
            268: two hundred sixty-eight



Odd number

There are 9 balls and 9 is an odd number. An odd number does not have 2 equal parts. One part is is 5 and the other is 4. 

Odd number


Quadrilaterals

Quadrilaterals are closed figures with 4 straight sides.

Quadrilaterals


Standard form

A familiar way of writing numbers using digits

                                     432



Tens

1 long is a physical representation of 10

10 ones equals 1 ten


Vertex

A point where 2 or more sides of shape meet. The vertex is the cube on the right is shown with a small white circle. The vertex of the triangle is shown with a small red circle.

Vertex



Fourths

The parts that we get when something is divided into 4 equal parts.




p.m.

     12:00 p.m. : noon. lunch time
     3:30 p.m. : half past 3. nap time
     6:45 p.m.: a quarter to 7.
     dinner time



Line plot

A line plot shows data on a number line using x or some other marks to show how many times a number appears. The number 6 appears 3 times.




Equation

                              4 + 8  = 12
             
                            14  =   6 + 8

Equation

 4 + 8  = 12
   
14  =   6 + 8




Compare

               4 is smaller than 8 or 4 < 8

                8 is bigger than 4 or 8 > 4


Compare

4 is smaller than 8 or 4 < 8

8 is bigger than 4 or 8 > 4



Centimeter ruler

Centimeter or cm
1 meter = 100 centimeters
The length of a baseball bat is about 1 meter
The width of a finger or the diamater of a wedding ring is about 1 centimeter long

Centimeter ruler


Count on

5 + 3

            

            

            ☺
            ☺     

Count on

5 + 3








USA money

One dollar + 1 quarter + 1 dime + 1 nickel + 1 penny = 1 dollars and 41 cents.




Fractions

Fractions


Regroup

Regroup 15 ones as 1 ten and 5 ones

Regroup 15 ones as 1 ten and 5 ones


Pictograph

Key of a pictograph. Each face = 1 player.
2 people loves soccer.

Pictograph


Flat

10 tens or 10 long  = 1 hundred or 1 flat




Sequence

                 +5      +5           +5
       3
         8      13     18

Sequence

     +5      +5           +5
3
         8      13     18



Place value

The value of a digit based on where the digit is located. The place value of 4 in 546 is 40.





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