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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 (memorization not intended), such as:
• counting on and counting back
• making 10
• doubles
• using addition to subtract
to determine the basic addition facts to 18 and related subtraction facts.
• Achievement Indicators
(It is not intended that students recall the basic facts but become familiar with strategies to mentally determine sums and differences.)
- Use and describe a personal strategy for determining a given sum.
- Use and describe a personal strategy for determining a given difference.
- Write the related subtraction fact for a given addition fact.
- Write the related addition fact for a given subtraction fact.
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