Modeling Add and Subtracting Models

Which problem is represented in the model?

• 0.32 - 0.17

• 0.49 - 0.32

• 0.32 + 0.17

• 0.49 - 0.17

Which equation matches the model?

• 0.73 - 0.23 = 0.50
• 0.50 + 0.23 = 0.73
• 0.73 + 0.23 = 0.50
• 0.73 - 0.50 = 0.23

What equation matches this model?

• 0.32 + 0.17 = 0.49
• 0.32 - 0.17 = 0.49
• 0.49 - 0.17 = 0.32
• 0.49 + 0.17 = 0.32

Does this model represent addition or subtraction?

• addition

• subtraction

What is the answer to this model?

• 0.19

• 0.61

• 0.42

• 0.2

Which problem is represented by this model? BE CAREFUL!

• 0.27 - 0.9

• 0.18 + 0.09

• 0.9 + 0.18

• 0.27 - 0.09

What equation matches this model?

• 0.7 - 0.44 = 1.14 
• 1.14 - 0.44 = 0.7
• 1.14 + 0.7 = 0.44
• 0.7 + 0.44 = 1.14

Which decimal represents the amount shaded on the models?  

• 183
• 1.83
• 1.083
• 0.83

Which of the decimals is equivalent to the value represented by the hundreds grid?

• 0.37
• 0.38
• 0.83
• 0.86

Which addition expression adds up to 7.29?

• 7.00 + 7.29

• 4.00 + 0.29

• 4.62 + 9.00

• 4.18 + 3.11