0015 0016 Gr5 S C01L1HW 115024 - Team Patton

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Number and Operations in Base Ten 5.NBT.7

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Find 0.43 + 0.81. Use models.

Lesson 5 Hands On: Add Decimals Using Models

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Use 10-by-10 grids to model 0.43.

To show 0.43, shade forty-three hundredths of a 10-by-10 grid.

Forty-three hundredths is equal to 43 small squares.

0.43 + 0.81

Model 0.81.

To show 0.81, shade an additional eighty-one hundredths using a different color.

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Add. There is 1 one. There are 2 tenths. There are 4 hundredths.

So, 0.43 + 0.81 = 1.24.

1 one, 2 tenths, and 4 hundredths is equal to 1.24.

Check Use estimation to check for reasonableness. 0 + 1 = 1 and 1.24 1

Lesson 5My Homework 333

Practice

Add. Shade the decimal models.

1. 0.51 + 0.63 = 1.14

2. 1.93 + 1.73 = 3.66

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Problem Solving

3. Norah wants to download two different applications on her cell phone. One used 2.42 megabytes and the other one used 1.76 megabytes. How many total megabytes of memory will Norah use to download the two applications? Draw decimals models to find the sum.

4.18 megabytes; See students' models.

4.

4 Model Math Write a real-world problem

that can be solved by adding 1.39 and 2.45 using decimal

models. Then solve.

Sample answer: The cost of a drink is $1.39. The

cost of a bag of pretzels is $2.45. What is the

MWYMOMRYESBGEAARTBKHYATISNE!

total cost for both items?; $3.84

5. Dorian feeds his dog 7.5 pounds of food in a week. He feeds his cat 3.75 pounds of food in a week. How many total pounds of food do his pets eat in a week? Draw decimal models to find the sum.

11.25 pounds; See students' models.

334 Chapter 5Add and Subtract Decimals

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