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Each game has 10 questions.
Green box means correct.
Yellow box means incorrect.
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 1 - Number
Standard 1.N.10 - Complete the subtraction sentence by filling in the missing number with operands up to 18.
Included Skills:
Describe and use mental mathematics strategies for basic addition facts and related subtraction facts to 18.
• Use and describe a mental mathematics strategy for determining a given sum.
• Use and describe a mental mathematics strategy for determining a given difference.
• Use and describe mental mathematics strategies, such as:
- counting on and counting back.
- making 10.
- using doubles.
- thinking addition for subtraction.
• Refine mental mathematics strategies to increase their efficiency.
• Write the related subtraction fact for a given addition fact.
• Write the related addition fact for a given subtraction fact.
• Demonstrate understanding and application of strategies for addition facts up to and including 9 + 9 and related subtraction facts.
• Demonstrate recall/memorization of addition facts to a sum of 5 and related subtraction facts.
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