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 2nd Grade Number Sense:  Standards and Practice Problem(s)
VoiceThread
Mathcasts

2NS.1.0 Students understand the relationship between numbers, quantities, and place value in whole numbers up to 1,000.

EV: 2 NS 1.0

For Educators
2NS.1.1 Count, read, and write whole numbers to 1,000 and identify the place value for each digit.
      


 
Ready
2NS.1.2 Use words, models, and expanded forms (e.g., 45 = 4 tens + 5) to represent numbers (to 1,000).
      
2NS1-2
Ready
2NS.1.3 Order and compare whole numbers to 1,000 by using the symbols <, =, >.
      
Ready

 

2NS.2.0 Students estimate, calculate, and solve problems involving addition and subtraction of two-and three-digit numbers.

      

 
 EV: 1(10)
2NS.2.1 Understand and use the inverse relationship between addition and subtraction (e.g., an opposite number sentence for 8 + 6 = 14 is 14 - 6 = 8) to solve problems and check solutions.
      
Ready
2NS.2.2 Find the sum or difference of two whole numbers up to three digits long.
            
Ready
2NS.2.3 Use mental arithmetic to find the sum or difference of two two-digit numbers.
      
Ready

 

 2NS.3.0 Students model and solve simple problems involving multiplication and division.

  
2NS.3.1 Use repeated addition, arrays, and counting by multiples to do multiplication.
      
Ready
2NS.3.2 Use repeated subtraction, equal sharing, and forming equal groups with remainders to do division.
        
Ready
2NS.3.3 Know the multiplication tables of 2s, 5s, and 10s (to "times 10") and commit them to memory.
      

 2NS3-3

Ready

 

2NS.4.0 Students understand that fractions and decimals may refer to parts of a set and parts of a whole.


  
2NS.4.1 Recognize, name, and compare unit fractions from 1/12 to 1/2.
       
Ready
2NS.4.2 Recognize fractions of a whole and parts of a group (e.g., one-fourth of a pie, two-thirds of 15 balls).
     
Ready
2NS.4.3 Know that when all fractional parts are included, such as four-fourths, the result is equal to the whole and to one.
     
Ready

 

2NS.5.0 Students model and solve problems by representing, adding, and subtracting amounts of money.


  
2NS.5.1 Solve problems using combinations of coins and bills
      
Ready
2NS.5.2 Know and use the decimal notation and the dollar and cent symbols for money.
      
Ready

 

 

2NS.6.0 Students use estimation strategies in computation and problem solving that involve numbers that use the ones, tens, hundreds, and thousands places.

  
2NS.6.1 Recognize when an estimate is reasonable in measurements (e.g., closest inch).
      
Ready

 

 

Keywords: addition, word problems

 

Home > Mathcasts Library > By Grade Level > K-7 >  2nd Grade  > 2nd Grade Number Sense

 


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