Methods to estimate the sum

Describe the method used to estimate the sum, difference, product, or quotient. Then describe a better method and revise the estimate. 1) 362 - 118 ≈ 400 - 100 = 300 2) 19 x 2 ≈ 20 x 0 = 0 3) 148 + 138 ≈ 100 + 100 = 200 4) 305 ÷ 16 ≈ 300 ÷ 20 = 15

Numerics

Writing: You want to know whether 5 hours is enough time to read a book for class. To be sure you finish, should your estimate of the number of pages you can read per hour be high or low? Explain the reasoning.

Numerics

Short Response: You are mailing 19 packages. It costs between $9 and $12 to mail each package. Estimate the total cost. Explain the method.

Estimates

Suppose you estimate the quotient 472 ÷ 58 using 500 ÷ 50 and using 420 ÷ 60. Which estimate should give a high estimate? Which estimate should give a low estimate? Explain the reasoning.

Jacobian's

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