8×21=
To solve this mathematical problem, we need to multiply a whole number, 8, with the fraction, 21.
Here are the steps:
- Step 1: Identify the given values. The integer is 8 and the fraction is 21.
- Step 2: Apply the multiplication formula for an integer and a fraction: a×cb=ca×b.
- Step 3: Multiply the integer by the numerator of the fraction: 8×1=8.
- Step 4: Divide the result by the denominator of the fraction: 28=4.
- Step 5: Simplify the fraction if necessary. In this case, 28 simplifies directly to 4.
Therefore, the multiplication of 8 by 21 is 4.
In the context of the multiple-choice options provided, the correct answer is choice (4): 4.