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

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

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

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

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

6. 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.

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

8. 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.

9. 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.

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

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

12. 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.

13. 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.

14. 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.

15. 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: multiplication_math_fourth_4th_grade.htm