Rounding and Estimating

This week we have been rounding and estimating! We know that when estimating you need to find the closet decade or landmark number. Sometimes these numbers with the “big fat mama zeroes” in the one’s place, can also be called benchmark numbers. When estimating by tens, on a number line, any number with 5 in the one’s place is called the midpoint number because it is halfway between two decade numbers. For example 85 is the midpoint number between 80 and 90. Today we are going to begin rounding by 100s. On a number line, the midpoint number when rounding by 100s would be any number that ends in 50. Watch below to learn more about rounding by 100s.