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Multiplying multidigit whole numbers by fractions September 22, 2014 Multiplication Quiz • This is an independent assignment. When you are finished turn in your paper and wait for further instructions. • You will have 20 minutes. Do your best and remember, SHOW YOUR WORK! • Mathematical Practices: • Practice 1: Make sense of problems and persevere in solving them • Practice 2: Reason abstractly and quantitatively • Practice 4: Model with Mathematics Multiply then divide by the same number • 3x2= • 3x2x10÷10= Multiply then divide by the same number • 5x .3= • 5x.3x10÷10= Multiply then divide by the same number • 3 x 2.5= • 3 x 2.5 x 10÷10= Mathematical Practices: Practice 6: Attend to Precision Practice 1: Make sense of problems and persevere in solving them Practice 2: Reason abstractly and quantitatively Practice 8: Look for and express regularity in repeated reasoning Decompose Decimals 7.463 How can this number be broken into two different units? Can it be done more than one way? Can you use a picture? Mathematical Practices: 1. Make sense of problems and persevere in solving them 3. Construct viable arguments and critique the reasoning of others 4. Model with mathematics 5. Use appropriate tools strategically Word Problem of the Day! • The fifth grade craft club is making aprons to sell. Each apron takes 1.25 yards of fabric that costs $3 per yard and 4.5 yards of trim that costs $2 per yard. What does it cost the club to make one apron? If the club wants to make $1.75 profit on each apron, how much should they charge per apron? Multi-digit Multiplication and decimals 43 x 2.4 Round the factors to estimate: Find the actual product: Use an area model and solve using the standard algorithm 3.5 x 42 Area model and standard algorithm 15.6 x 73 Area model and the standard algorithm Mathematical Practices: 1. Make sense of problems and persevere in solving them 2. Reason abstractly and quantitatively 3. Construct viable arguments and critique the reasoning of others 4. Model with mathematics 5. Attend to precision Problem Set • This is independent work. If you are confident please move your number to “Willing to Help” • If you need help you may ask one of these students. • Remember your accountable talk, do not give answers to your classmates, rather help them understand what you are doing. • I will call back small groups Exit ticket • Find the Product using the Standard Algorithm and an area model 33.2x 21= 1.7X55= If the product of 485x 35 is 16,975, what is the product of 485 x 3.5? How do you know?
