Subtract Decimal Numbers using Partial Differences 5-101

Model and subtract ones, tenths, and hundredths using Base 10 discs and number bonds. What's 4.7 - 1.8? To get more tenths, shift 1 to get 3 ones and 17 tenths. Since 3 - 1 = 2 and 1.7 - .8 = .9, 4.7 - 1.8 = 2 + .9 = 2.9. Lay the foundation for vertical algorithms by regrouping and subtracting units that are the same.

 
 

1. Learn

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Model and subtract ones, tenths, and hundredths using Base 10 discs and number bonds. What's 4.7 - 1.8? To get more tenths, shift 1 to get 3 ones and 17 tenths. Since 3 - 1 = 2 and 1.7 - .8 = .9, 4.7 - 1.8 = 2 + .9 = 2.9. Lay the foundation for vertical algorithms by regrouping and subtracting units that are the same.

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2. Practice

Lesson
5-101
Lesson
5-101
Lesson
5-101
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3. Apply

POD
5-101
POD
5-101
POD
5-101
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