# Tuesday 10/17/17 – Math

# Welcome to Math!

### Please take out:

- Module 5 packet
- spiral notebook
- pencil
- Chromebook

### Warm-Up:

### 5.1: Dividing Whole Numbers

**Learning Target:** Students will be able to fluently divide multi-digit numbers using the standard algorithm.

### Engage:

There are 10,845 books in a library. If 45 books can fit on a shelf, how many shelves are needed?

- In this problem, which number is the
**divisor**? The**dividend**? How could we**estimate**the**quotient**?

### Explore:

Round each number to the tens, hundreds, thousands, ten thousands, and hundred thousands place:

- 256,341
- 968,398
- 1,245,172
- 2,045,917

### Explain:

How can you check your answer to a division problem?

Example 2, p. 109:

- What does the remainder mean in this problem?
- Which value represents the dividend? Which represents the divisor?
- Suppose Callie packs 10 books in each box. Will she have any books left over? How do you know?

### Elaborate:

What steps should be used when dividing large numbers?

Guided Practice:

- In a problem like 20 ÷ 5, which number goes inside the division house? What is this called? Which one goes outside? What is the name for this?
- When would you use an estimate for your answer instead of the actual quotient?

### Important Understandings:

- You can use estimation to predict the approximate quotient of multi-digit whole numbers.
- Use long division to find exact quotients. Copy down these steps:

- Quotients sometimes include remainders “left over,” which can be written with an R or as a fraction.

### Expected – 5.1 Practice

### Accelerated – 5.1 Quiz

### Homework:

**Expected & Accelerated:**

- Finish dashboard assignments.

(Switch name cards for next class.)