Math Games

Grade 3 - Number

Standard 3.N.10 - Practice identifying different properties of addition given an equation.

Included Skills:

Apply mental mathematics strategies and number properties, such as:
• using doubles
• making 10
• using the commutative property
• using the property of zero
• thinking addition for subtraction to recall basic addition facts to 18 and related subtraction facts.

• Achievement Indicators
- Describe a mental mathematics strategy that could be used to determine a given basic fact, such as:
• doubles, e.g., for 6 + 8, think 7 + 7
• doubles plus one, e.g., for 6 + 7, think 6 + 6 + 1
• doubles take away one, e.g., for 6 + 7, think 7 + 7 – 1
• doubles plus two, e.g., for 6 + 8, think 6 + 6 + 2
• doubles take away two, e.g., for 6 + 8, think 8 + 8 – 2
• making 10, e.g., for 6 + 8, think 6 + 4 + 4 or 8 + 2 + 4
• commutative property, e.g., for 3 + 9, think 9 + 3
• addition to subtraction, e.g., for 13 – 7, think 7 + ? = 13.
- Provide a rule for determining answers for adding and subtracting zero.
- Recall basic addition facts to 18 and related subtraction facts to solve problems.