328+127 rounding or compatible numbers to estimate the sum

Since 328 is closer to 300 than to 400, you would have 300 take its place in the equation. And since 127 is closer to 100 than to 200, you would replace 127 with 100. So your equation is now 300+100, which is 400. If you're supposed to round to the nearest ten, you would follow the same steps to get to 330+130=460