EG

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 * ESTIMATING SUMS & DIFFERENCES**

VOCAB to know : Clustering,and Front-end estimation

To esimate a sum or differance round the decimal to the nearest ten & then add, or subtract. Congradulations!You just learned how to estimate sums & diffences!
 * How to estimate sums & differences**.

Now try this problom below.

The yearly rainfall in Hawaii (in inches) is 89.7, 100.2, 96.5,and 98.7.

Now go here for more examples