Front End Estimation: that is using only the highest place value when estimating. eg. 125 + 476 = turns into 100 + 400 = It is like under estimating.

Relative Size Estimation: rounding to the nearest highest place value.eg. 125 + 476 = turns into 100 + 500 = 125 is between 100 and 200 but closer to 100476 is between 400 and 500 but closer to 500It is like rounding.

Estimating - getting an approximate answer.Calculating - getting an exact answer.

HW Textbook pg. 48 - 51 # 4 - 25 even numbers