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5-Minute Check •Multiply. •2 x 44 •4 x 39 •3 x $21 •5 x 89 •A truck weighs twice as heavy as a car. The car weighs 3,000 pounds. How much does the truck weigh? Multiply Multi-Digit Numbers (even across zeros) Objective By the end of the lesson, you will be able to multiply a three-digit and a four-digit number by a one-digit number. Standard 4NS3.2 - Demonstrate an understanding of, and the ability to use, standard algorithms for multiplying a multidigit number by a two-digit number and for dividing a multidigit number by a one-digit Introduce Let’s look at a problem: 1, 124 x3 • How many ones are in 1,124? • Multiply the ones by the 3. What is the product? Should we carry over? • Multiply the tens. What is the product? Should we carry over any? • Multiply the hundreds. What is the product? Should we carry over? Example • Today is Anna’s birthday, and she is nine years old. There are 365 days in one year. How many days old is Anna? • You multiply multi-digit numbers the same way you multiply a two-digit number by a one-digit number. • 365 x9 First, multiply the 9 by 5. Anything to carry over? Next, multiply the 9 by the 6 (tens) and add the carried-over amount. Anything to carry over? Then, multiply the 9 by the 3 (hundreds) and add the LET”S LISTEN!! • Let’s hear from Mrs. Verughese about multiplying money using four-digit by one-digit. • Mrs. Verughese!! • Let’s listen to Mr. Parsons as he explains another problem with a zero as one of the digits. • Mr. Parsons!! Teach • Let’s look at a problem that has a zero in it: • 1,104 x3 • How many ones are in 1,104? Multiply the ones by 3. What is the product? Anything to carry over? • How many tens are in 1,104? What is the product of any number and zero? Then, add the carried over amount. Anything to carry over? • Multiply the hundreds. What is the product? Anything to carry over? • Multiply the thousands. What is the product? Add the Bales Bucks Multiply. Check for reasonableness. 135 x 2 532 x 6 $2,957 x 3 7,832 x 7 Multiply. Check for reasonableness by estimating the products. 303 x 3 $507 x 6 908 x 8 2,007 x 8 Assignment Page 280 - #’s 7 – 12 Page 286 - #’s 9 - 15 Get them all correct – No Math Homework