Math Games

Grade 2 - Number

Standard 2.N.9 - Simplify both sides of the equation. Fill in the missing number with sums up to 100 to make the equation true.

Included Skills:

Demonstrate an understanding of addition (limited to 1 and 2-digit numerals) with answers to 100 and the corresponding subtraction by:
• using personal strategies for adding and subtracting with and without the support of manipulatives
• creating and solving problems that involve addition and subtraction
• explaining that the order in which numbers are added does not affect the sum
• explaining that the order in which numbers are subtracted may affect the difference.

• Achievement Indicators
- Model addition and subtraction using concrete materials or visual representations and record the process symbolically.
- Create an addition or a subtraction number sentence and a story problem for a given solution.
- Solve a given problem involving a missing addend and describe the strategy used.
- Solve a given problem involving a missing minuend or subtrahend and describe the strategy used.
- Match a number sentence to a given missing addend problem.
- Match a number sentence to a given missing subtrahend or minuend problem.
- Add a given set of numbers in two different ways, and explain why the sum is the same, e.g., 2 + 5 + 3 + 8 = (2 + 3) + 5 + 8 or 5 + 3 + (8 + 2).