The product of 23.4556 and 6.66 rounded to the nearest ten is 156?
true or false.
i believe its false but i'm not sure.

Without having to even solve for the equation, you know it has to be false since the given answer (156) is not rounded to the nearest ten. The tens place would be the second place from the right (the 5). The 6 is in the ones place and the 1 is in the hundredths place. If you needed to round it to the nearest ten, you would have to round 156 up to 160 (use normal rounding rules- 5 or greater rounds up and less than 5 rounds down) so that there is a 0 in the ones place.