Exploring Decimal Addition and Subtraction Techniques

The video tutorial teaches how to use visual models to perform addition and subtraction with decimals. It begins with an introduction to the concept of using hundredths grids as models. The tutorial then provides four examples: two on adding decimals and two on subtracting decimals. Each example involves shading or crossing out boxes on a grid to visually represent the arithmetic operation, helping learners understand the process of combining or removing decimal values.

What is the purpose of using models in adding and subtracting decimals?

• To practice drawing skills

• To avoid using calculators

• To make the process faster

• To visualize the problem

How many boxes do you need to shade for 0.82 in a hundredths grid?

• 50

• 82

• 21

• 100

What is the sum of 0.82 and 0.21 using the hundredths grid?

• 1.03

• 0.89

• 1.00

• 1.10

How many boxes do you need to shade for 0.52 in a hundredths grid?

• 25

• 100

• 37

• 52

What is the sum of 0.52 and 0.37 using the hundredths grid?

• 0.99

• 1.00

• 0.79

• 0.89

What is the first step in subtracting 0.51 from 1.12 using the hundredths grid?

• Cross out 1.12

• Shade 0.51

• Shade 1.12

• Cross out 0.51

How many boxes do you need to cross out for 0.51 in a hundredths grid?

• 51

• 12

• 100

• 61

What is the result of subtracting 0.51 from 1.12 using the hundredths grid?

• 0.91

• 0.81

• 0.71

• 0.61

How many boxes do you need to shade for 0.92 in a hundredths grid?

• 22

• 50

• 92

• 100

What is the result of subtracting 0.22 from 0.92 using the hundredths grid?

• 0.80

• 0.50

• 0.70

• 0.60