Math Grade 4Mrs. EnnisDecimals

Part 1Lesson Twenty-Six

1. 85 + 302 + E = 392

2. 3006 – 85 = G

3. M ÷ 6 = 6

4. 4 x 5 = J x 4

5. 2 x 3 x V = 26

6. It is 12:30 now. What time was it 20 minutes ago?

7. What is the perimeter of a regular pentagon with side 6cm?

8. Write in standard form: 2 thousands, 4 tens, 3 ones, 8 hundreds?

9. Pam has $2.50 in quarters and $0.95 in nickels. How many coins does she have?

10.Will collected 856 cans one week and 1,026 cans the next week. How many more cans must be collected to reach his goal of 3,045 cans?

Decimal Place Value

3, 4 5 6, 7 8 9 O

ne

sTen

s

Hu

nd

red

s

Th

ou

san

ds

Ten

Th

ou

san

ds

Hu

nd

red

Th

ou

san

ds

Millio

ns

Ten

ths

Hu

nd

red

th

s.1 2

Reading Decimals• Read the number before the

decimal point.• Say “and” when you get to

the decimal.• Read the number after the

decimal.• Say the name of the place

that the decimal ends in.

Example

8,243.67

Eight thousand, two hundred forty-threeand sixty-sevenhundredths

Example

57.26

Fifty sevenand

twenty-sixhundredths

Example

324.03

Three hundred twenty-fourandthreehundredths

Example

89.7

Eighty-nineand

seventenths

Example

4002.3

Four thousand twoandthreetenths

Expanded Form

• Write the number that appears before the decimal point in expanded form.

• For decimals, place a zero in the ones place.

• Also, substitute zeroes for all spaces after the decimal point that come before the digit that you are working with.

Example: Write 13.36 in expanded form.

Remember, deal with the number before the decimal first.

10 + 3

Then, do the decimal part.

0.060.3 ++

Example: Write 207.45 in expanded form.

Remember, deal with the number before the decimal first.

200 + 7

Then, do the decimal part.

0.050.4 ++

Example: Write 1,564.82 in expanded form.

Remember, deal with the number before the decimal first.

1000 + 500 + 60 + 4

Then, do the decimal part.

0.020.8++

You try it: Write 590.73 in expanded form.

500 + 90 0.030.7 ++

You try it: Write 1230.06 in expanded form.

1000 + 200 + 30 0.06+

From Words to Standard Form

• Read everything before the word “and.” Write that number.

• Place a decimal point at the word “and.”

• Read the last word of the sentence to see how many decimal places you need.

• Fill in the decimal places with your number. Use zeroes to fill any empty spaces.

Example: Write the following number in standard form: two hundred six and fifty-four hundredths

206.

The word “hundredths” indicates that we need two decimal places.

54

Example: Write the following number in standard form: ninety-one and twenty-two hundredths

91.

The word “hundredths” indicates that we need two decimal places.

22

Example: Write the following number in standard form: four thousand seventeen and three hundredths

4017

.

The word “hundredths” indicates that we need two decimal places.

03

Example: Write the following number in standard form: eight hundred twenty and four tenths

820.

The word “tenths” indicates that we need one decimal place.

4

Example: Write the following number in standard form: seventy-one and nine tenths

71.

The word “tenths” indicates that we need one decimal place.

9

Example: Write the following number in standard form: one hundred thirty and five

tenths

130.

The word “tenths” indicates that we need one decimal place.

5

One Whole

1010

can also be written

1

Writing Fractions as Decimals

910

can also be written

.9

Writing Fractions as Decimals

110

can also be written

.1

Writing Fractions as Decimals

410

can also be written

.4

Writing Fractions as Decimals

310

can also be written

.3

Writing Fractions as Decimals

610

can also be written

.6

Writing Fractions as Decimals

45100

can also be written

.45

Writing Fractions as Decimals

26100

can also be written

.26

Writing Fractions as Decimals

31100

can also be written

.31

Writing Fractions as Decimals

59100

can also be written

.59

Writing Fractions as Decimals

20100

can also be written

.20

Writing Fractions as Decimals

77100

can also be written

.77

Also remember that

.3is equal to .30

Also remember that

.2is equal to .20

Also remember that

.5is equal to .50

Also remember that

.8is equal to .80

Also remember that

.1is equal to .10

Online Practice

http://www.aaamath.com/dec37bx2.htmhttp://www.decimalsquares.com/dsGames/games/beatclock.html

http://www.mrnussbaum.com/docrb1.htm

Math Fun:The Fugitive Feline opened at movie theaters on Monday. The 1st day 35 people saw the movie. On the 2nd day 16 more people came than on the 1st day, so that 86 people had seen the movie after the 2nd day. If each day 16 more people saw the movie than the day before, on what day would 700 people have seen the movie?

Hint: Make a chart!

Answer:

Solution: 700 people will have seen the movie afterthe 8th day.

http://mathlearnnc.sharpschool.com/UserFiles/Servers/Server_4507209/File/Instructional%20Resources/G4WW1-4.pdf

Resources:

http://www.mrhammond.org/math/mathlessons/

http://www.mrnussbaum.com/docrb1.htm

http://www.decimalsquares.com/dsGames/games/beatclock.htmlhttp://www.aaamath.com/dec37bx2.htm