Math Games

Grade 3 - Number

Standard 3.N.9 - Complete the addition sentence by filling in the missing number with sums up to 1000.

Included Skills:

Demonstrate an understanding of addition and subtraction of numbers with answers to 1000 (limited to 1-, 2-, and 3-digit numerals) by
• using personal strategies for adding and subtracting with and without the support of manipulatives
• creating and solving problems in contexts that involve addition and subtraction of numbers concretely, pictorially, and symbolically.

• Model the addition of two or more numbers using concrete or visual representations, and record the process symbolically.
• Model the subtraction of two numbers using concrete or visual representations, and record the process symbolically.
• Create an addition or subtraction story problem for a solution.
• Determine the sum of two numbers using a personal strategy (e.g., for 326 + 48, record 300 +  60 + 14).
• Determine the difference of two numbers using a personal strategy (e.g., for 127 – 38, record 38 + 2 + 80 + 7 or 127 – 20 – 10 – 8).
• Solve a problem involving the sum or difference of two numbers.