Math Games

Grade 3 - Number

Standard 3.N.9 - Practice adding objects up to 20.

Included Skills:

Demonstrate an understanding of addition and subtraction of numbers with answers to 1000 (limited to 1-, 2- and 3-digit numerals), concretely, pictorially and symbolically, by:
• using personal strategies for adding and subtracting with and without the support of manipulatives.
• creating and solving problems in context that involve addition and subtraction of numbers.
• Model the addition of two or more given numbers, using concrete or visual representations, and record the process symbolically.
• Model the subtraction of two given numbers, using concrete or visual representations, and record the process symbolically.
• Create an addition or subtraction story problem for a given solution.
• Determine the sum of two given numbers, using a personal strategy; e.g., for 326 + 48, record 300 + 60 + 14.
• Determine the difference of two given numbers, using a personal strategy; e.g., for 127 – 38, record 38 + 2 + 80 + 7 or 127 – 20 – 10 – 8.
• Refine personal strategies to increase their efficiency.
• Solve a given problem involving the sum or difference of two given numbers.
• Solve a given problem using the standard/traditional addition algorithm.
• Solve a given problem using the standard/traditional subtraction algorithm.