Section 3.2 Estimating Decimal Products and Quotients

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Presentation transcript:

Section 3.2 Estimating Decimal Products and Quotients Algebra Concepts Section 3.2 Estimating Decimal Products and Quotients

Consider the problem 5.86×4. Can you do this problem without paper or a calculator? Can you get an idea of what the answer would be? 6×4=24 𝑠𝑜 𝑡ℎ𝑒 𝑎𝑛𝑠𝑤𝑒𝑟 𝑖𝑠 ≈24. We also know the answer would be less than 24 because 5.86 < 6

Katie bought 5 picture frames on sale for $3. 70 Katie bought 5 picture frames on sale for $3.70. The clerk charged her $22.30 before tax. Should she question this?

When estimating quotients, work with numbers that are easy to divide mentally. Compatible numbers- numbers that are easy to compute mentally

Is your estimate reasonable? Divide 15.2÷3.95 Estimate the answer using compatible numbers 16÷4=4 Is 4 a good estimate? Calculator answer 3.848101266…

Estimate #1 396×2.3 #2 372÷9.8 #3 9.285÷2.76