10/06/21 – Math – Estimating Sums

When estimating sums, you choose which benchmark to round to. This means you decide whether to round to the nearest tens, hundreds, or thousands. The point of this is to get an approximate answer.

Here are two strategies.

Compatible numbers means rounding, using your judgement to the nearest tens, hundreds, or thousands.

Compensation means rounding down, then up, then down, regardless of whether the numbers are round up numbers or round down ones.

In class, I recommended you to stick with using compatible numbers (what you already know about rounding)

Try it out! Try the examples in the pictures and then make some of your own questions up.