Direction: Read the following passage carefully to answer the question...
9 groups of 9 = 81
∴ 81 ÷ 9 = 9
Therefore, the answer is option (d) 9.
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Direction: Read the following passage carefully to answer the question...
Possible response:
Division Facts with Numbers 0-9: Answering 81-9
To answer the division facts given below using numbers 0-9 only, we need to find a single-digit number that, when multiplied by 9, gives us 81. We can use trial and error or some mental math strategies to do this. Here is one possible approach:
- Recall that 9 times any number ends in 9 (e.g., 9x1=9, 9x2=18, 9x3=27, etc.).
- Since we want 81 as the product, we know that the ones digit of the multiplier must be 1.
- To find the tens digit, we can divide 81 by 9 and see what number we get. We can do this by using the fact that 81 is divisible by 9 (e.g., 81÷9=9). Therefore, the tens digit of the multiplier must be 9.
- Combining the digits, we get 9 as the answer, since 9x9=81.
Therefore, option 'D' (9) is the correct answer to the division fact 81÷9. We can also verify this solution by doing the inverse operation of multiplication, which gives us 9x9=81.
In summary, we can use some basic arithmetic principles to solve division facts with numbers 0-9, by using mental math, patterns, or estimation. This skill is important for building a strong foundation in math and for solving more complex problems later on.
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