If the sum of - were estimated, we would round to and to So we made some Estimation Games for you to practice with!

It took you 3 minutes and 20 seconds to make one card, but you need to do 15 more This probably won't be the exact answer but it may be close enough for some purposes.

There are different methods for estimation that are useful for different types of problems. If working with extremely large numbers, you might want to round to the nearest one million.

The number was rounded down by 45 and was rounded up by The three most useful methods are the rounding, front-end and clustering methods. Determine the place value to use for the particular problem you want to estimate.

The actual difference is It is important for you to be able to estimate how many things you can see, or how long something is or how big something is.

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Estimating a Difference