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Everyday Mathematics Grade 5 – Unit 2 Estimation and Computation 2.1 Estimation Challenge • If you were measuring the length of a school bus, would you use inches, feet, or yards? Why? • Use the unit of measure you chose to estimate the length of a school bus. 2.2 Addition of Whole Numbers and Decimals • Use the information on Student Reference Book, pages 28-30 to solve the Check Your Understanding Problems on the bottom of page 30. 2.3 Subtraction of Whole Numbers and Decimals • Solve each problem 81-47= ? 8.1 – 4.7 = ? • Describe how the two problems are alike and different. 2.4 Addition and Subtraction Number Stories • Niko has $8.00. Does he have enough money to buy 3 fancy pencils for $1.98 each and an eraser for $1.73? • What is the total cost of 3 pencils and 1 eraser? 2.5 Estimate Your Reaction Time • Cut out the Grab-It Gauge on Activity Sheet 2 in your math journal. 2.6 Chance Events Survey the class for the results of the home experiments. Ask your classmates: What true statements can you make to compare the results of your home experiment with the class experiment? 2.7 Estimating Products • Use the numbers 10, 6, 9, 8, and 5 to make expressions that are equivalent names for 1, 10, and 100. Use addition, subtraction, multiplication, division, or exponents, and try to use all 5 numbers. • Record your expression on the class name-collection box for that number. 2.8 Multiplication of Whole Numbers and Decimals • Estimate the solution to this problem. Write a number sentence to show how you found your estimate. 3.7 * 6.2 2.9 The Lattice Method of Multiplication • Study the problems in column A on journal page 54. Then use lattice multiplication to solve the problems in column B. 2.10 Comparing Millions, Billions, and Trillions • Explain the strategy you would use to find the number of minutes in a year. 2.11 Progress Check 2 Complete the Self Assessment.