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Grades 1 and 2 - Math - Elementary School - Using Facts to Solve Missing Number Problems
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Avg score: 70% • Most missed: “What is the missing number: | 20 - ?”

Using facts to solve problems means understanding that subtraction is the inverse of addition, and vise versa. Therefore, if you know that 6 + 4 = 10, you could find the missing number in 10 - ? = 4 by using the same numbers.

Grades 1 and 2 - Math - Elementary School - Using Facts to Solve Missing Number Problems
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10 Questions

1. You could use 45 + 55 = 100 to help you solve:
2. Which fact would help you solve:
10 - ? = 4
3. What is the missing number:
12 + ? = 20
4. You could use 100 - 25 = 75 to help you solve:
5. If 16 + 84 = 100 is true, which of the following is not true?
6. If 15 + 85 = 100 is true, which of the following is not true?
7. If 95 + 5 = 100 is true, which of the following is not true?
8. Which number is missing:
? + 5 = 20
9. Which number is missing:
100- ? = 20
10. What is the missing number:
20 - ? = 7

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