Mrs. Ennis Decimals Part 1 Lesson Twenty-Six Math Grade 4 Mrs. Ennis Decimals Part 1 Lesson Twenty-Six

85 + 302 + E = 392 3006 – 85 = G M ÷ 6 = 6 4 x 5 = J x 4 2 x 3 x V = 26 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?

Pam has $2. 50 in quarters and $0. 95 in nickels Pam has $2.50 in quarters and $0.95 in nickels. How many coins does she have? 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

.1 2 3, 4 5 6, 7 8 9 Hundredths Millions Hundred Thousands Ten Thousands Thousands Ones Tenths Hundreds Tens

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.

8,243.67 Example Eight thousand, two hundred forty-three and sixty-seven hundredths

Example 57.26 Fifty seven and twenty-six hundredths

Example 324.03 Three hundred twenty-four and three hundredths

Example 89.7 Eighty-nine and seven tenths

Example 4002.3 Four thousand two and three tenths

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. 10 + 3 + 0.3 + 0.06 Remember, deal with the number before the decimal first. Then, do the decimal part.

Example: Write 207.45 in expanded form. 200 + 7 + 0.4 + 0.05 Remember, deal with the number before the decimal first. Then, do the decimal part.

Example: Write 1,564.82 in expanded form. 1000 + 500 + 60 + 4 + 0.8 + 0.02 Remember, deal with the number before the decimal first. Then, do the decimal part.

You try it: Write 590.73 in expanded form. + 500 + 90 + 0.7 0.03

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

Example: Write the following number in standard form: ninety-one and twenty-two hundredths 91 . 22 The word “hundredths” indicates that we need two decimal places.

Example: Write the following number in standard form: four thousand seventeen and three hundredths 4017 . 03 The word “hundredths” indicates that we need two decimal places.

820 . 4 The word “tenths” indicates that we need one decimal place. Example: Write the following number in standard form: eight hundred twenty and four tenths 820 . 4 The word “tenths” indicates that we need one decimal place.

71 . 9 The word “tenths” indicates that we need one decimal place. Example: Write the following number in standard form: seventy-one and nine tenths 71 . 9 The word “tenths” indicates that we need one decimal place.

130 . 5 The word “tenths” indicates that we need one decimal place. Example: Write the following number in standard form: one hundred thirty and five tenths 130 . 5 The word “tenths” indicates that we need one decimal place.

One Whole 10 1 can also be written

Writing Fractions as Decimals 9 10 .9 can also be written

Writing Fractions as Decimals 1 10 .1 can also be written

Writing Fractions as Decimals 4 10 .4 can also be written

Writing Fractions as Decimals 3 10 .3 can also be written

Writing Fractions as Decimals 6 10 .6 can also be written

Writing Fractions as Decimals 45 100 .45 can also be written

Writing Fractions as Decimals 26 100 .26 can also be written

Writing Fractions as Decimals 31 100 .31 can also be written

Writing Fractions as Decimals 59 100 .59 can also be written

Writing Fractions as Decimals 20 100 .20 can also be written

Writing Fractions as Decimals 77 100 .77 can also be written

Also remember that .3 .30 is equal to

Also remember that .2 .20 is equal to

Also remember that .5 .50 is equal to

Also remember that .8 .80 is equal to

Also remember that .1 .10 is equal to

Online Practice http://www.aaamath.com/dec37bx2.htm http://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 after the 8th day.

Resources: http://mathlearnnc.sharpschool.com/UserFiles/Servers/Server_4507209/File/Instructional%20Resources/G4WW1-4.pdf http://www.mrhammond.org/math/mathlessons/ http://www.mrnussbaum.com/docrb1.htm http://www.decimalsquares.com/dsGames/games/beatclock.html http://www.aaamath.com/dec37bx2.htm