1. When estimating, 1.) You should be able to do the computation in your head 2.) Your answer should be close to the exact answer 1-1 Estimating sums, differences and products

2. A.) Estimating sums and differences Method one: Rounding Required Steps: Round each number, then add or subtract the rounded values

3. Examples: Estimate (Answers may vary) 1.) 24.745 + 54.27 2.) 1.845 + 56.9 3.) 628.283 - 191.06 4.) 0.82 - 0.547

4. Y ou can use clustering when you are adding several numbers of similar value. Required Steps: 1.) Find a single number that is close to all the numbers 2.) Use multiplication to find the estimate Method two: Clustering (Addition only)

5. Examples: Estimate using clustering 1.) 207.2 + 193.86 + 211.98 + 196.403 2.) 3,890.4 + 4,067.102 + 4,283.75

6. B.) Estimating Products Required Steps: Round each number, then multiply using mental math. Examples: Estimate each product (answers may vary) 1.) 365.48 42.7 2.) (18.43)(22.29) 3.) 0.92 31.08 4.) 9.86 741.604

7. Demonstrate Understanding: Estimate using the methods discussed in class (answers may vary) 1.) 361.238 - 23.7 2.) 835.4 + 173.645 2.) 307.5 + 291.02 + 302.18 4.) 5.384 46.81