Multiplying 2 digit by 1 digit numbers Literature Link: Anno’s Mysterious Multiplying Jar by Masaichiro and Mitsumasa Anno Lesson 6-3 CCSS 4.NBT.5, 4.OA.3

MATH Essential Questions How do I know which computational method (mental math, estimation, paper and pencil, and calculator) to use? MATH Essential Questions

MATH Essential Questions How do mathematical operations relate to each other? MATH Essential Questions

MATH Essential Questions Why do I need mathematical operations? MATH Essential Questions

Warm Up Put these numbers in order from least to greatest. 4,576 5,476 5,647 4,765

Today’s Lesson In this lesson, you will multiply two-digit numbers by one-digit numbers and check your answers for reasonableness. Let’s look at the Envision Video for this lesson and take the quiz.

Think and Write What careers require a person to master multiplication?

Checking Answers When you multiply larger numbers, it is helpful to check to see if your answer is correct by using estimation. Estimation, or rounding, allows you to see if your answer is close to the estimate. When estimating, round to the nearest TEN for the closest estimate.

Rounding Review When rounding to the nearest ten, look at the ONES place. Remember if the number is four or lower, round DOWN. If the number is five or higher, round UP.

Estimation Practice Round these numbers to the nearest ten. 456 712 998 1,342 5,677

Multiply, then Check! Multiply to solve. Then estimate to check. 45 X 7 64 X 8 32 X 9 56 X 3

Problem 1 A bus holds 54 people. If there are 7 buses, how many people can they hold in all? Solve, then estimate to check.

Problem 2 A football team has 45 players that are active on game day. How many players are active if there are 6 teams playing today? Solve, then estimate to check.

Problem 3 Mrs. Monroe drives 38 miles to and from work every day. How many miles does she drive this week if she works 6 days? Solve, then estimate to check.

Lesson Wrap Up In this lesson, you learned to use the standard algorithm to multiply a two digit number by a one digit number and estimate to check your answer for reasonableness. Center Activity – (6-3). Homework (6-3 Practice) for one “Paw Signature” and (6-3 Reaching & Practice) if you want two “Paw Signatures.” Website for Practice: Website for Practice: http://www.internet4classrooms.com/skill_builders/ multiplication_math_fourth_4th_grade.htm