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Section 7-2 Operations on Decimals 379 b. Another student claims that the fractions are not equal and wants to know if there is any way the same calcu- lator can determine which is greater. 19. Angus adds 7.5 and 2.8, and his answer is 9.13. Explain the mistake he made and show how partial sums can help him get the correct answer. 20. Students are asked to add one tenth and 0.1. Several differ- ent answers were submitted: 1.1, 0.11, 0.2, 0.21, and 10.1. For each response, write a decimal number sentence that would produce that answer. 21. Describe and correct Amy's error in the solution. 4.9 X 3.8 186.2 22. Belle knows to move the decimal point in a multiplication problem by counting the number of digits after each factor and adding them together and putting the decimal point in that spot in the product. She turns in the following problem: 3.2 X 2.5 a. Is she correct? b. What is the danger of teaching this method of decimal multiplication? timating the product help avoi

Section 7-2 Operations on Decimals 379 b. Another student claims that the fractions are not equal and wants to know if there is any way the same calcu- lator can determine which is greater. 19. Angus adds 7.5 and 2.8, and his answer is 9.13. Explain the mistake he made and show how partial sums can help him get the correct answer. 20. Students are asked to add one tenth and 0.1. Several differ- ent answers were submitted: 1.1, 0.11, 0.2, 0.21, and 10.1. For each response, write a decimal number sentence that would produce that answer. 21. Describe and correct Amy's error in the solution. 4.9 X 3.8 186.2 22. Belle knows to move the decimal point in a multiplication problem by counting the number of digits after each factor and adding them together and putting the decimal point in that spot in the product. She turns in the following problem: 3.2 X 2.5 a. Is she correct? b. What is the danger of teaching this method of decimal multiplication? timating the product help avoi

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.3: Geometric Sequences
Problem 81E
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Section 7-2 Operations on Decimals 379 b. Another student claims that the fractions are not equal and wants to know if there is any way the same calcu- lator can determine which is greater. 19. Angus adds 7.5 and 2.8, and his answer is 9.13. Explain the mistake he made and show how partial sums can help him get the correct answer. 20. Students are asked to add one tenth and 0.1. Several differ- ent answers were submitted: 1.1, 0.11, 0.2, 0.21, and 10.1. For each response, write a decimal number sentence that would produce that answer. 21. Describe and correct Amy's error in the solution. 4.9 X 3.8 186.2 22. Belle knows to move the decimal point in a multiplication problem by counting the number of digits after each factor and adding them together and putting the decimal point in that spot in the product. She turns in the following problem: 3.2 X 2.5 a. Is she correct? b. What is the danger of teaching this method of decimal multiplication? timating the product help avoi
Transcribed Image Text:Section 7-2 Operations on Decimals 379 b. Another student claims that the fractions are not equal and wants to know if there is any way the same calcu- lator can determine which is greater. 19. Angus adds 7.5 and 2.8, and his answer is 9.13. Explain the mistake he made and show how partial sums can help him get the correct answer. 20. Students are asked to add one tenth and 0.1. Several differ- ent answers were submitted: 1.1, 0.11, 0.2, 0.21, and 10.1. For each response, write a decimal number sentence that would produce that answer. 21. Describe and correct Amy's error in the solution. 4.9 X 3.8 186.2 22. Belle knows to move the decimal point in a multiplication problem by counting the number of digits after each factor and adding them together and putting the decimal point in that spot in the product. She turns in the following problem: 3.2 X 2.5 a. Is she correct? b. What is the danger of teaching this method of decimal multiplication? timating the product help avoi
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