CHAPTER 1 DECIMALS RETEACH/REVIEW

Decimal Place Value

Place Value

• It is going to be very important for you to know and understand the decimal place value.

• Today you will practice writing decimals in word form and taking decimals written in word form and writing them in number form.

How to Write Decimals in Word Form

You have to use the number in the farthest right place to name you decimal.

For example 0.65 -The five is the farthest right place and it is in the hundredths place so you would write this as Sixty Five hundredths.

The same would go for 0.08 - The eight is the farthest right number and it is in the hundredths place so you would label it eight hundredths.

Multiple Choice

What is 0.86 in word form?

• Eighty six thousandths

• Eighty Six hundredths

• Eighty Six

• Eighty Six tenths

Open Ended

Write 0.654 in word form.

Open Ended

Write 0.07 in word form.

Open Ended

Write 0.009 in word form.

Decimals with Whole Numbers

• You can also write decimals that have whole numbers. You use the word AND in place of the decimal.

• For example 543.88 would be written as five hundred fourty three and eighty eight hundredths.

Open Ended

Write 43.22 in word form

Open Ended

Write 437.771 in word form.

From word form to decimal form

• Be sure to pay close attention to the "th" in the words. This will tell you if it is part of the decimal or the whole number. Hundred would be in the whole number, but hundredth would be part of the decimal.

• For example, fifty seven and three hundred fourty seven thousandths would be written as 57.347.

• Use the and to tell you where to place the decimal.

Open Ended

Write three hundred fifty two and seven tenths in number form.

Open Ended

Write three hundred fifty two and seven thousandths in number form. (Yes, it is different from the last slide).

Open Ended

Write six hundred forty nine thousand one hundred twenty five and forty three thousandths in word form.

Match

Match the vocabulary words

• Standard Form

• Expanded Form

• Written Form

Way of writing numbers using only digits

Write a number using the place value

A way to write numbers with only words

• Way of writing numbers using only digits

• Write a number using the place value

• A way to write numbers with only words

Multiple Choice

What does the 7 in the number 89.073 represent?

• 7/1000

• 7/100

• 7/10

• 70

Multiple Choice

What does the 5 in the decimal .257 represent?

• fifths
• five tenths
• fiftieths
• five hundredths

Multiple Choice

Write the number in standard form:

$$\left(3\ \times1\right)\ +\ \left(3\ \times\ \frac{1}{10}\right)\ +\ \left(7\ \times\frac{1}{100}\right)\ +\ \left(9\ \times\ \frac{1}{1000}\right)$$  

• 3,379

• 3.3070

• 3.379

• 30.379

Multiple Choice

(3 X 100) + (3 X 10) + (3 X 1) + (9 X 0.1) + (3 X 0.01) + (8 X 0.001)

• 333.938
• 339.938
• 111.111
• 313.938

Multiple Choice

The temperature in Houston in degrees Fahrenheit is shown in expanded form.

(9 x 10) + (7 x 1) + (1 x 1/10) + (5 x 1/100)

What is this number in standard form?

• 97.105

• 907.15

• 97.15

• 97.015

Multiple Choice

Which number represents six and eighty-four thousandths in standard form?  

• 684
• 6.84
• 68.40
• 6.084

Multiple Choice

Which decimal number represents seven hundred ninety-two and five hundredths?

• 792.500
• 792.05
• 792.005
• 792,500

Multiple Choice

How is seventy-two and eighty-five thousandths written as a number?

• 72.850
• 72.805
• 72.085
• 70.285

Multiple Choice

What is the word form for 348.203?

• three hundred forty-eight and twenty-three thousandths
• three hundred forty-eight and two hundred three thousandths
• three hundred forty-eight and two hundred three
• three hundred forty eight and two hundred three hundredths

Drag and Drop

Choose the TWO correct number forms: 82.719​

Placeholder

​ ​ ​

Placeholder

Drag these tiles and drop them in the correct blank above

eighty-two and seven hundred nineteen thousandths

(8 x 10)+(2 x 1)+(7 x 0.1)+(1 x 0.01)+(9 x 0.001)

eighty-two and seven hundred nineteen hundredths

(8 x 10)+(2 x 1)+(7 x 0.1)+(1 x 0.1)+(9 x 0.001)

eighty-two and seven hundred nineteen tenths

eighty-two and seven hundred nineteen millionths

Comparing & Ordering Decimals Numbers
3.3 Go Math

Match

Match the following

• Three

• Three hundred

• Three hundredths

• Three hundred and three tenths

• Three tenths

3.0

300

0.03

300.3

0.3

• 3.0

• 300

• 0.03

• 300.3

• 0.3

Match

Match the following

• Three

• Three hundred

• Three hundredths

• Three hundred and three tenths

• Three tenths

3.0

300

0.03

300.3

0.3

• 3.0

• 300

• 0.03

• 300.3

• 0.3

Reorder

Reorder the following from least to greatest

• 0.045

• 0.234

• 0.9

• 1.23

• 1.5

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Math Response

Compare 0.3 and 0.5

Type answer here

Correct Answer: 0.3<0.5

Deg^°

Rad

Remember

​When you compare decimals

You need to find the greatest place value with two different values for each number.

345.56 and 345.59 means we have to look to the hundredths to find that 345.56 is less than 345.59

Dropdown

Compare: 3.94 is _ than 3.87​

Select answer

Rounding Decimals

Let's practice rounding decimals. BEFORE we get to the multiple choice slide, SHOW YOUR WORK on your whiteboard or piece of paper. You may use the number line strategy OR the place value chart strategy to round the decimal (whatever works best for your brain!)

Multiple Select

Round 7.86 to the nearest tenth.

• 7.86

• 7.8

• 7.96

• 7.9

• 7.90

Multiple Select

Round 8.434 to the nearest hundredth.

• 8.43

• 8.434

• 8.4

• 8.430

Multiple Select

Round 9.1 to the nearest whole number

• 9.1

• 9

• 10

• 9.0

• 10.1

Multiple Select

Round 9.563 to the nearest hundredth

• 9.53

• 9.56

• 9.57

• 9.563

• 9.560

Multiple Choice

Round 23.542 to the nearest hundredth.

• 23.5

• 23.6

• 23.54

• 23

Multiple Choice

Round 1.823 to the nearest whole number.

• 1

• 1.8

• 2

• 2.8

Multiple Choice

Round 72.178 to the nearest hundredth.

• 72.2
• 72.18
• 72
• 73.18

Multiple Choice

Round 3.572 to the nearest tenth.

• 3.6

• 3.5

• 3.57

• 4

Multiple Choice

Round 12.435 to the nearest one.

• 12

• 13

• 12.4

• 12.44

Multiple Choice

Round 4.073 to the nearest tenth.

• 4.1

• 4.07

• 4

• 5

HINT: YOU MIGHT WANT TO USE A NUMBER LINE FOR THIS ONE!

Multiple Select

Round 8.96 to the nearest tenth

• 8.10

• 8.9

• 9.0

• 9.9