Casio fx-55 Посібник для вчителя - Сторінка 2

Переглянути онлайн або завантажити pdf Посібник для вчителя для Калькулятор Casio fx-55. Casio fx-55 2 сторінки. Casio fx-55: supplementary guide

The Smart Calculator

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Exploring Patterns

Using the Activity:

Students discover how to use the

• The

key can be used to enter the first factor into the memory of the calculator.

• The

key can be used to recall the first factor and to find other products.

Example For the first product in problem 1, 16

10 = 160. Continue using a similar key sequence to find all of the products. Note: The

Assessment Encourage students to check their final products to be sure they see a pattern.

Answers

See example for key sequence. l. 16; 160; 1,600; 16,000. The first two digits are 1 and 6. Each product has one

more 0 at the end than the previous product. 2. 1,089; 2,178; 3,267; 4,356. The first digits are the whole

numbers in order starting with 1, the second digits are whole numbers in order starting with 0, the third digits

are whole numbers starting at 8 and going backwards, and the last digits are whole numbers starting at 9 and

going backwards. 3. 98,901; 87,912; 76,923; 65,934. The first digits are whole numbers starting with 9 and

going backwards, the second digits are whole numbers starting with 8 and going backwards, the third digits are

all 9s, the fourth digits are whole numbers in order starting with 0, and the last digits are whole numbers in

order starting with 1. 4. 9,801; 98,901; 989,901; 9,899,901. The first digits are all 9s, the second digits are all

8s, the next to last digits are all 0s, and the last digits are all 1s. Each product has one more 9 after the 8 than

the previous product. 5. 72; 792; 7,992; 79,992. The first digits are all 7s and the last digits are all 2s. Each

product has one more 9 after the 7 than the previous product. 6. 111,111; 222,222; 333,333; 444,444. The first

product is all 1s, the second all 2s, the third all 3s, and the fourth all 4s.

Thinking Cap

As an extension, students continue the pattern they found in each problem. They can use the key

sequence they discovered to check their answers.

8 • Casio Fx 55

and the

key should be used to clear the memory before a new first factor is entered.

Topic:

Number Patterns

Objective:

To use the calculator to discover

and extend patterns.

NCTM Standards:

Patterns, and Functions

keys to find products that form patterns.

16. For the second product,

Communication,