 • #### BIOGRAPHY REPORTS • #### COMMON CORE STATE STANDARDS • #### UNIT 9 - PERCENTS • #### BIOGRAPHY REPORT PROJECT • #### ENERGY • #### INDUSTRIAL REVOLUTION # Mrs. Tait's & Mrs. Fleischhauer's Class

### Unit 4 (Big Ideas Math) - Multiply By Two-Digit Numbers

Multiply By Two-Digit Numbers

Dear Family,

In this chapter, your student is learning to multiply two-digit numbers. Your student will learn multiplication strategies for estimating, using area models, using the Distributive Property, and using partial products. The vocabulary phrase for this chapter is compatible numbers. Compatible numbers are numbers that are easy to multiply and are close to the actual numbers being multiplied.

You can practice multiplication at a warehouse club store where people buy large quantities of items. For example, 1 large box contains 10 smaller boxes, and each smaller box contains 8 packages of fruit snacks. Here are some questions to ask your student.

• What expression would you use to find the total number of fruit snacks in 1 large box? In 5 large boxes?
• What are some additional examples of items that are packaged and sold this way?

Another way to help your student practice multiplication is to go online and find the ticket prices for a nearby attraction, such as a movie theater, museum, or theme park. The tickets should have at least two different prices—for example, adults and children. Then use the information to complete the following exercises.

• Create a group of at least 10 individuals attending the event.
• Write an expression to find the cost of tickets for the group. Find the cost.
• Suppose the price for one type of ticket goes up. Explain how your expression should change and how the total cost changes.

By the end of this chapter, your student should feel confident with the learning targets and success criteria on the next page. Encourage your student to think of other reasons to multiply numbers, such as finding the number of seats in an auditorium.

Have a great time practicing multiplication!

 Lesson Learning Target Success Criteria 4.1 Multiply by Tens Use place value and properties to multiply by multiples of ten. · I can use place value to multiply by multiples of ten. · I can use the Associative Property to multiply by multiples of ten. · I can describe a pattern with zeros when multiplying by multiples of ten. 4.2 Estimate Products Use rounding and compatible numbers to estimate products. · I can use rounding to estimate a product. · I can use compatible numbers to estimate a product. · I can explain different ways to estimate a product. 4.3 Use Area Models to Multiply Two-Digit Numbers Use area models and partial products to multiply. · I can use an area model to break apart the factors of a product. · I can relate an area model to partial products. · I can add partial products to find a product. 4.4 Use the Distributive Property to Multiply Two-Digit Numbers Use area models and the Distributive Property to multiply. · I can use an area model and partial products to multiply. · I can use an area model and the Distributive Property to multiply. 4.5 Use Partial Products to Multiply Two-Digit Numbers Use place value and partial products to multiply. · I can use place value to tell the value of each digit in a number. · I can write the partial products for a multiplication problem. · I can add the partial products to find a product. 4.6 Multiply Two-Digit Numbers Multiply two-digit numbers. · I can multiply to find the partial products. · I can show how to regroup ones, tens, and hundreds. · I can add the partial products to find the product. 4.7 Practice Multiplication Strategies Use strategies to multiply two-digit numbers. · I can choose a strategy to multiply. · I can multiply two-digit numbers. · I can explain the strategy I used to multiply. 4.8 Problem Solving: Multiplication with Two-Digit Numbers Solve multi-step word problems involving two-digit multiplication. · I can understand a problem. · I can make a plan to solve using letters to represent the unknown numbers. · I can solve a problem using an equation.