Math Games

Grade 3 - The Number System

Standard 3.NS.1.9 - Complete the addition sentence by filling in the missing number with sums up to 1000.

Included Skills:

Students will be expected to demonstrate an understanding of addition and subtraction of numbers (limited to 1-, 2-, and 3-digit numerals) with answers to 1000 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 concretely, pictorially, and symbolically

• Performance Indicators
- N09.01 Model the addition of two or more given numbers using concrete or visual representations and record the process symbolically.
- N09.02 Model the subtraction of two given numbers using concrete or visual representations and record the process symbolically.
- N09.03 Create an addition or subtraction story problem for a given solution.
- N09.04 Determine the sum of two given numbers using a personal strategy, e.g., for 326 + 48, record 300 + 60 + 14.
- N09.05 Determine the difference of two given numbers using a personal strategy, e.g., for 127 – 38, record 2 + 80 + or 127 – 20 – 10 – 8.
- N09.06 Solve a given problem involving the sum or difference of two given numbers.