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.

 DoublesIn 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 groupsGroups have the same number of items.

 Estimate:No need to get an exact answer.Possible answer: 35, 40 or 30 ♥ ♥        ♥ ♥♥ ♥ ♥ ♥   ♥ ♥ ♥  ♥ ♥ ♥ ♥ ♥     ♥ ♥ ♥ ♥ ♥ ♥       ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥

 a.m. 12:00 a.m. : midnight. sleeping time7:30 a.m. : half past 7. wake up time10:15 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.

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

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

 Count back7 - 4 ☺☺☺☺☺☺☺                               ☺☺☺☺☺☺                               ☺☺☺☺☺                               ☺☺☺☺                               ☺☺☺
 Count back7 - 4 ☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺

 1 Dollar1 dollar  = 100 cents

 Number line

 Word form of number 345: three hundred, forty-five            268: two hundred sixty-eight

 Odd numberThere 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.

 Standard formA familiar way of writing numbers using digits 432

 Tens1 long is a physical representation of 10

 VertexA 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.

 FourthsThe 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 plotA 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 < 88 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

 Count on5 + 3 ☺☺☺☺☺            ☺☺☺☺☺☺            ☺☺☺☺☺☺☺            ☺☺☺☺☺☺☺☺
 Count on5 + 3 ☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺

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

 Fractions

 RegroupRegroup 15 ones as 1 ten and 5 ones

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

 Flat10 tens or 10 long  = 1 hundred or 1 flat

 Sequence +5      +5           +5       3         8      13     18
 Sequence +5      +5           +53         8      13     18

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

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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