Dividing Decimals by Whole Numbers Lesson 25 WarmUp 9 13 99 295 R4 Find the value of 1 45 5 2 130 10 3 1584 16 4 2634 8 Dividing Decimals by Whole Numbers Find quotients of expressions where decimals are divided by whole numbers ID: 778865
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Slide1
Core Focus on Decimals& Fractions
Dividing Decimals by Whole Numbers
Lesson 2.5
Slide2Warm-Up
9
$13
99
295 R4
Find the value of:
1. 45 ÷ 5
2. $130 ÷ 10
3. 1584 ÷ 16
4. 2634 ÷ 8
Slide3Dividing Decimals by Whole NumbersFind quotients of expressions where decimals are divided by whole numbers.
Lesson 2.5
Slide4Dividing Decimals with Whole Numbers
Divide as if both dividend and divisor
ar
e
whole numbers.Move the decimal point into the quotient directly above the decimal point in the dividend. Insert zeros if necessary to hold place value.
Some answers will need to be rounded to a given place value.
Slide5Example 1
Joe bought 3.9 pounds of candy corn for a harvest party. He divided it among himself and nine friends. How many pounds of candy corn did each person get?
Write the problem.
3.9 ÷ 10
Divide as if the divisor and
dividend were whole numbers.
Move the decimal point into
the quotient directly above the
decimal point in the dividend.
Each person received 0.39 pounds of candy corn.
Slide6Example 2
Find the value of 2.97 ÷ 30.
Divide as if the divisor and dividend were whole numbers.
Move the decimal point into the quotient directly above the decimal point in the dividend.
2.97 ÷ 30 = 0.099
Insert a zero on the end of the dividend. Continue dividing.
Slide7Good to Know!Sometimes you may need to round to a designated place-value.
Divide until the quotient has one more place-value position than where it is being rounded to. (This helps you know whether to round up or down.)
You may need to add one or more zeros at the end of the decimal dividend to find the quotient.
Slide8Example 3Janease spent $3.22 to download three songs. Each song cost about the same amount. How much did she spend on each song? Round
to nearest penny (hundredth) if necessary.
Write the problem.
3.22 ÷ 3
Divide as if the divisor and dividend
were whole numbers.
Continue until you have gone one more
place value past the hundredth position.
Insert a zero on the end of the dividend and continue dividing.
Slide9Example 3 Continued…Janease spent $3.22 to download three songs. Each song cost about the same amount. How much did she spend on each song? Round
to nearest penny (hundredth) if necessary.
Move decimal point up into the quotient.
Round to nearest penny.
1.073 → 1.07
Janease spent about $1.07 on each song.
Slide10Example 4Find the value of 16 ÷ 5.Place a decimal point in the dividend at the end of the whole number.
Divide.
Move the decimal into the quotient.
16 ÷ 5 = 3.2
Slide11Communication PromptDo base-ten blocks allow you visualize the process of dividing decimals by whole numbers? Why or why not?
Slide123.22 ÷ 2
10.1 ÷ 5
Sixteen people won $1,000.00 to split evenly. How much did each person receive?
If Martin paid $4.45 for 3 pounds of apples, how much did each pound of apples cost? Round to the nearest penny, if necessary.
Exit Problems
1.61
2.02
$62.50
$1.48 per pound