Final answer:
The best way to estimate before dividing 346 by 67 is option (b) 346 divided by 65 because it simplifies the divisor to a more manageable number for mental math without significantly altering the dividend.
Step-by-step explanation:
The best way to estimate before dividing 346÷67 would be option (b) 346÷65. This is because rounding the divisor (67) to a number that is easier to work with, such as 65, simplifies the mental math. The dividend (346) remains the same, which means the estimate will be relatively close to the exact answer.
Using option (a) 300÷67 would result in a significant alteration of the dividend, hence a less accurate estimate. Option (c) 346÷67 actually presents the precise calculation, not an estimate. Finally, option (d) is a repetition of option (b) and also represents a good estimation approach, as replacing 67 with a nicer number like 65 makes mental division more feasible.