# Notes: Decimal Basics Writing Decimals Standard Form: 21.51

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Notes: Decimal Basics Writing Decimals Standard Form: 21.51
Word Form: twenty-one and fifty-one hundredths Expanded Form:

Comparing and Ordering Decimals Notes
Order from least to greatest: 9.02, 9.2, 9.002 Compare each place value. Line up decimals if needed. Compare digits in the greatest place.

Examples 12.2 ___ 12.9 5.4 ___ 5.40 5.05 ___ 5.50 0.098___ 0.98
5.4 ___ 5.40 5.05 ___ 5.50 0.098___ 0.98 23.12___

Rounding Decimals Notes
Round to the nearest hundredth. Underline the place value that you are rounding. Circle the number to the right of it. If the number to the right is 5 or greater, round up. If the number is less than 5, the place stays the same. Drop off the numbers to the right of the place value that you are rounding to. -

Put these numbers in order from least to greatest: 7. 22, 70. 2, 70
Round these numbers to the nearest hundred: 551 6,423 11,292.14 Write in expanded form: word form:

4.981 2.008 0.159 12.602 Round each number to the nearest hundredth.
Round each number to the nearest tenth. 0.159 12.602

Round 13.961 to the nearest tenth.
Write in expanded form: word form: Round to the nearest tenth. Round to the nearest hundredth. Estimate \$5.21 x \$7.98 =

3. Round 123.991 to the nearest tenth.
Write each decimal in standard form: four tenths five and seven hundredths Fill in the blank with >, <, or = 23.04 ___ ___ 14.40 3. Round to the nearest tenth. 4. Round to the nearest hundredth.

Decimal Computations Adding and Subtracting Decimals
*Remember to line up the decimals. Ex: 5.4 – 1.23 Ex:

Multiplying Decimals Multiply the factors like they are whole numbers.
Count how many numbers are to the right of the decimal in the original problem. Begin at the right in the product, count over that many spaces, and put your decimal point.

Find the product. 1.6 x x 2.3 3.1 x x 4.8

Practice Problems 6.25 x x 2 4 x x 4.1

Dividing Decimals Vocab (pg. 13)
divisor  dividend  quotient

Dividing Decimals Notes
Move the decimal in the divisor all the way to the right. Move the decimal point in the dividend the same number of places. Divide as normal. Place the decimal point in the answer in the same point above the place in the dividend.

Find the quotient. 6.37 ÷ ÷ 0.9 11.24 ÷ ÷ 0.12

Rounding Decimals for Estimation
Estimate \$ \$2.12. In your head, round to the easiest place. Once numbers are rounded in your head, follow directions. You should be able to estimate all in your head! If you can’t you’ve made it too hard! Round to the easiest place for you!

Estimate each answer. \$ = 71  9 = 29 x 3.1 = 31 – 6 =