Regroup numbers with more than 9 tenths or 9 hundredths into simplest unit form and vice versa.
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Students have dealt with regrouping decimal units in limited cases in previous lessons, e.g., 6 tenths = 60 hundredths. Today’s lesson extends that work to regrouping to various units, include ones that are not adjacent to the given unit. This serves a few purposes: (1) it helps to reinforce the 10-to-1 relationship in decimal numbers, (2) it helps students understand the value of a zero at the end of a decimal (e.g., 0.6 = 0.60), and (3) it prepares students for addition and subtraction of decimals, where students may need to convert a value in one unit to another unit in order to be able to add or subtract like units.
If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Tasks 2 and 3 (benefit from worked examples). You could consolidate these to be a single Anchor Task. Find more guidance on adapting our math curriculum for remote learning here.
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A dime is $${{1\over10}}$$ of a dollar and a penny is $${{1\over100}}$$ of a dollar.
Would you rather have 4 one-dollar bills and 1 dime, 42 dimes, or 413 pennies? Justify your answer.
a. Regroup each of the following values in terms of tenths. Then do the same in terms of hundredths.
i. $${2{4\over10}}$$ = ____ tenths = ____ hundredths
ii. 3 ones 5 tenths 7 hundredths = ____ tenths ____ hundredths = ____ hundredths
b. How would you write each of the values in part (a) as decimals?
a. Fill in the blanks to make the following true.
i. 170 hundredths = _____ tenths _____ hundredths = _____ ones _____ tenths _____ hundredths
ii. $${{407\over100}}$$ = _____ tenths _____ hundredths = _____ ones _____ tenths _____ hundredths
b. How would you write each of the values in part (a) as decimals?
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Grade 4 Mathematics > Module 6 > Topic B > Lesson 8 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..
Modified by The Match Foundation, Inc.?
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