Identify numbers: Step 1: Identify the numbers to be multiplied. We have 21 and 51.
Multiply numerators and denominators: Step 2: Multiply the numerators together and the denominators together. 1×1=1 for the numerators, and 2×5=10 for the denominators. So, 21×51=101.
Check for errors: Step 3: Check the calculation for any errors. Numerator product is 1, and denominator product is 10, which seems correct.
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