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?

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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 number; use relationships between them to simplify computations and to check results.

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? Multiply the thousands. What is the product? What is the final answer?

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 carried-over amount.

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 carried over amount.

Bales Bucks Multiply. Check for reasonableness by estimating the products. 303 x 3 $507 x x 8 2,007 x 8 8 x 47 Multiply. Check for reasonableness. 135 x x 6 $2,957 x 3 7,832 x 7

Assignment Page #’s 7 – 12 Page #’s Get them all correct – No Math Homework