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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.
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.9 - Practice subtracting half from a number. Recognize the similar numbers in subtracting half of a number.
Included Skills:
Describe and use mental mathematics strategies for basic addition facts and related subtraction facts to 18.
• Achievement Indicators:
- 1N9.1 Use and describe a mental mathematics strategy for determining a given sum.
- 1N9.2 Use and describe a mental mathematics strategy for determining a given difference.
- 1N9.3 Use and describe mental mathematics strategies, such as:
• counting on and counting back
• making 10
• using doubles
• thinking addition for subtraction.
- 1N9.4 Refine mental mathematics strategies to increase their efficiency.
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