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Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level

The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.

Green box means correct.

Yellow box means incorrect.

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Grade 3 - Number

Standard 3.N.10 - Complete the subtraction sentence by filling in the missing number with operands up to 18.

Included Skills:

Apply mental mathematics strategies and number properties in order to understand and recall basic addition facts and related subtraction facts to 18.

• 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 for subtraction; e.g., for 13 – 7, think 7 + ? = 13.

• Apply the property of zero to determine a given sum or difference when adding or subtracting zero; e.g., 5 + 0 = 5 and 5 – 0 = 5.

• Provide a rule for determining answers when adding and subtracting zero.

• Apply a mental mathematics strategy to provide a solution to a given basic addition fact up to and including 9 + 9 or a related subtraction fact.

• Demonstrate understanding, recall/memorization and application of addition facts up to and including 9 + 9 and related subtraction facts.

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