Which statements are true about the estimation of decimal products? Check all that apply.

A. Estimation gives an approximate answer.

B. Estimation always results in a product greater than the exact answer.

C. Estimation always results in a product less than the exact answer.

D. Estimation can be done by rounding each decimal to the nearest whole number.

Estimation gives an approximate answer.

Step-by-step explanation:

Estimation, or approximation, should give you an answer which is broadly correct, say to the nearest 10 or 100, if you are working with bigger numbers.

For example:

You've decided to add another room to the carpet buying. The last room is 3.7m by 2.2m. How much carpet do I need for all three rooms?

3.7m is rounded up to 4m. 2.2m rounds down to 2m.

2 * 4 is 8m2, which gives a total, for all three rooms of 20m2.